A005382: Primes p such that 2p-1 is also prime

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/A005382.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/A005382.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/A005382.html

A005381: Numbers k such that k and k-1 are composite

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/A005381.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/A005381.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/A005381.html

A005349: Niven (or Harshad, or harshad) numbers: numbers that are divisible by the sum of their digits

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/Niven_numbers.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/Niven_numbers.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/Niven_numbers.html

My data have not been verified but my work is highly reproducible.
- Downloads (csv, img, dump) https://decompwlj.com/
- Algorithms https://oeis.org/wiki/Decomposition_into_weight_*_level_%2B_jump#Algorithms

A005279: Numbers having divisors d, e with d < e < 2*d

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/A005279.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/A005279.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/A005279.html

A005278: Noncototients: numbers k such that x - phi(x) = k has no solution

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/Noncototients.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/Noncototients.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/Noncototients.html

A005277: Nontotients: even numbers k such that phi(m) = k has no solution

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/Nontotients.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/Nontotients.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/Nontotients.html

A005244: A self-generating sequence: start with 2 and 3, take all products of any 2 previous elements, subtract 1 and adjoin them to the sequence

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/A005244.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/A005244.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/A005244.html

Decomposition into weight × level + jump of prime numbers in 3D, threejs - webGL (log(weight), log(level), log(jump))
https://decompwlj.com/3Dgraph/Prime_numbers.html

A005236: Barriers for omega(n): numbers n such that, for all m < n, m + omega(m) <= n

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/A005236.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/A005236.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/A005236.html

A005228: Sequence and first differences (A030124) together list all positive numbers exactly once

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/A005228.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/A005228.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/A005228.html

A005214: Triangular numbers together with squares (excluding 0)

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/A005214.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/A005214.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/A005214.html

This year, some Paris métro stations had to be closed because of flooding. Some stations cause more inconvenience when they're closed than others. One can attempt to identify them using network analysis, and I had fun trying to do so here:

https://benjamingeer.name/en/post/paris-rail-centrality/

Thanks to @bovine3dom for the tip about the GTFS data!

cc @Alon

A005153: Practical numbers: positive integers m such that every k <= sigma(m) is a sum of distinct divisors of m. Also called panarithmic numbers

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/Practical_numbers.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/Practical_numbers.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/Practical_numbers.html

My data have not been verified but my work is highly reproducible.
- Downloads (csv, img, dump) https://decompwlj.com/
- Algorithms https://oeis.org/wiki/Decomposition_into_weight_*_level_%2B_jump#Algorithms

A005117: Squarefree numbers: numbers that are not divisible by a square greater than 1

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/Squarefree_numbers.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/Squarefree_numbers.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/Squarefree_numbers.html

A005114: Untouchable numbers, also called nonaliquot numbers: impossible values for the sum of aliquot parts function (A001065)

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/Untouchable_numbers.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/Untouchable_numbers.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/Untouchable_numbers.html

A005101: Abundant numbers (sum of divisors of m exceeds 2m)

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/Abundant_numbers.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/Abundant_numbers.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/Abundant_numbers.html

A005100: Deficient numbers: numbers k such that sigma(k) < 2k

3D graph, threejs - webGL https://decompwlj.com/3Dgraph/Deficient_numbers.html
3D graph Gen, threejs animation https://decompwlj.com/3DgraphGen/Deficient_numbers.html
2D graph, first 500 terms https://decompwlj.com/2Dgraph500terms/Deficient_numbers.html

Decomposition into weight × level + jump of prime numbers in 3D, threejs - webGL (log(weight), log(level), log(jump))
https://decompwlj.com/3Dgraph/Prime_numbers.html