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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.

A365222 a(n) is the least semiprime such that a(n) - n and a(n) + n are the previous and the next semiprimes.

Table of values

n a(n)
1 34
2 185
3 262
4 407
5 314
6 371
7 194
8 2271
9 6218
10 4237
11 109898
12 110645
13 53602
14 169773
15 112298
16 163985
17 284738
18 48529
19 1033378
20 1781833
21 570502
22 1963091
23 12527458
24 6051613
25 30377422
26 19549343
27 66761746
28 7926901
29 363311378
30 5861227
31 676386278
32 136503631
33 72622874
34 51204973
35 375025874

List of values

[34, 185, 262, 407, 314, 371, 194, 2271, 6218, 4237, 109898, 110645, 53602, 169773, 112298, 163985, 284738, 48529, 1033378, 1781833, 570502, 1963091, 12527458, 6051613, 30377422, 19549343, 66761746, 7926901, 363311378, 5861227, 676386278, 136503631, 72622874, 51204973, 375025874]

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

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