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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.

A221742 Carmichael numbers of the form (6*k+1)*(12*k+1)*(18*k+1) which are the product of four prime numbers.

Table of values

n a(n)
1 172081
2 1773289
3 4463641
4 295643089
5 798770161
6 1976295241
7 122160500281
8 374464040689
9 444722065201
10 676328168881
11 1009514855521
12 2382986541601
13 3022286597929
14 9031805532361
15 33648448111489
16 155773422536761
17 206932492972801
18 366715617643441
19 708083570971801

List of values

[172081, 1773289, 4463641, 295643089, 798770161, 1976295241, 122160500281, 374464040689, 444722065201, 676328168881, 1009514855521, 2382986541601, 3022286597929, 9031805532361, 33648448111489, 155773422536761, 206932492972801, 366715617643441, 708083570971801]

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

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