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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.

A258929 a(n) is the unique even-valued residue modulo 5^n of a number m such that m^2+1 is divisible by 5^n.

Table of values

n a(n)
1 2
2 18
3 68
4 182
5 1068
6 1068
7 32318
8 280182
9 280182
10 3626068
11 23157318
12 120813568
13 1097376068
14 1097376068
15 11109655182
16 49925501068
17 355101282318
18 355101282318
19 15613890344818
20 15613890344818
21 365855836217682
22 2273204469030182
23 2273204469030182
24 49956920289342682

List of values

[2, 18, 68, 182, 1068, 1068, 32318, 280182, 280182, 3626068, 23157318, 120813568, 1097376068, 1097376068, 11109655182, 49925501068, 355101282318, 355101282318, 15613890344818, 15613890344818, 365855836217682, 2273204469030182, 2273204469030182, 49956920289342682]

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

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