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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A363061 Number of k <= P(n) such that rad(k) | P(n), where rad(n) = A007947(n) and P(n) = A002110(n).

Table of values

n a(n)
0 1
1 2
2 5
3 18
4 68
5 283
6 1161
7 4843
8 19985
9 83074
10 349670
11 1456458
12 6107257
13 25547835
14 106115655
15 440396113
16 1833079809
17 7642924612
18 31705433101
19 131711607956
20 546283729493
21 2257462298234
22 9339325821411
23 38593708318690
24 159600066415313
25 661371515924516
26 2736805917843710

List of values

[1, 2, 5, 18, 68, 283, 1161, 4843, 19985, 83074, 349670, 1456458, 6107257, 25547835, 106115655, 440396113, 1833079809, 7642924612, 31705433101, 131711607956, 546283729493, 2257462298234, 9339325821411, 38593708318690, 159600066415313, 661371515924516, 2736805917843710]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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