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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.

A280112 Indices of centered 10-gonal numbers (A062786) that are also triangular numbers (A000217).

Table of values

n a(n)
1 1
2 19
3 703
4 26677
5 1013005
6 38467495
7 1460751787
8 55470100393
9 2106403063129
10 79987846298491
11 3037431756279511
12 115342418892322909
13 4379974486151991013
14 166323688054883335567
15 6315920171599414760515
16 239838642832722877563985
17 9107552507471869932670897

List of values

[1, 19, 703, 26677, 1013005, 38467495, 1460751787, 55470100393, 2106403063129, 79987846298491, 3037431756279511, 115342418892322909, 4379974486151991013, 166323688054883335567, 6315920171599414760515, 239838642832722877563985, 9107552507471869932670897]

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

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