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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.

A138613 a(n) = sigma_2(a(n-1)): sum of squares of divisors of a(n-1) with a(1)=2.

Table of values

n a(n)
1 2
2 5
3 26
4 850
5 943950
6 1318281510000
7 2755017380686402917800000
8 10751241448828145947377163154256928532205365443200
9 186653497320711305248493130820948403307540799528422902350199946673943964748877201760000000000000000

List of values

[2, 5, 26, 850, 943950, 1318281510000, 2755017380686402917800000, 10751241448828145947377163154256928532205365443200, 186653497320711305248493130820948403307540799528422902350199946673943964748877201760000000000000000]

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

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