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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.

A242980 Carmichael numbers of the form (6*k + 1)*(12*k + 1)*(18*k + 1), where only two of the three numbers 6*k + 1, 12*k + 1, 18*k + 1 are prime.

Table of values

n a(n)
1 172081
2 1773289
3 4463641
4 47006785
5 295643089
6 798770161
7 1150270849
8 1420379065
9 1976295241
10 18390744505
11 122160500281
12 134642101321
13 215741809801
14 228944441089
15 263610459505
16 321140603665
17 374464040689
18 444722065201
19 676328168881
20 1009514855521

List of values

[172081, 1773289, 4463641, 47006785, 295643089, 798770161, 1150270849, 1420379065, 1976295241, 18390744505, 122160500281, 134642101321, 215741809801, 228944441089, 263610459505, 321140603665, 374464040689, 444722065201, 676328168881, 1009514855521]

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

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