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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.

A218709 a(n) is smallest number such that a(n)^2 + 1 is divisible by 13^n.

Table of values

n a(n)
0 0
1 5
2 70
3 239
4 239
5 143044
6 1999509
7 6826318
8 6826318
9 822557039
10 52199939826
11 603633907222
12 11356596271444
13 11356596271444
14 1828607235824962
15 13920898306972194
16 13920898306972194
17 2675587335039691558
18 49226908181248336040
19 513050126578538629605

List of values

[0, 5, 70, 239, 239, 143044, 1999509, 6826318, 6826318, 822557039, 52199939826, 603633907222, 11356596271444, 11356596271444, 1828607235824962, 13920898306972194, 13920898306972194, 2675587335039691558, 49226908181248336040, 513050126578538629605]

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

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