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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.

A264804 a(n) is least number > 0 such that the concatenation of a(1) ... a(n) is 11-gonal: (9n^2 - 7n)/2.

Table of values

n a(n)
1 1
2 1
3 526
4 64095
5 21420730041
6 4528059468080555555556
7 3834345160635370971474665069772601398563211
8 100751687713984558500838936986634939491022212000570658953744730444103042117925197608458

List of values

[1, 1, 526, 64095, 21420730041, 4528059468080555555556, 3834345160635370971474665069772601398563211, 100751687713984558500838936986634939491022212000570658953744730444103042117925197608458]

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

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