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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.

A331733 a(n) = sigma(A225546(n)), where sigma is the sum of divisors.

Table of values

n a(n)
1 1
2 3
3 7
4 4
5 31
6 15
7 511
8 12
9 13
10 63
11 131071
12 28
13 8589934591
14 1023
15 127
16 6
17 36893488147419103231
18 39
19 680564733841876926926749214863536422911
20 124
21 2047
22 262143
23 231584178474632390847141970017375815706539969331281128078915168015826259279871
24 60
25 121
26 17179869183
27 91
28 2044

List of values

[1, 3, 7, 4, 31, 15, 511, 12, 13, 63, 131071, 28, 8589934591, 1023, 127, 6, 36893488147419103231, 39, 680564733841876926926749214863536422911, 124, 2047, 262143, 231584178474632390847141970017375815706539969331281128078915168015826259279871, 60, 121, 17179869183, 91, 2044]

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

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