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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.

A138818 Concatenation of initial digit of n-th even superperfect number A061652(n), initial digit of n-th Mersenne prime A000668(n) and initial digit of n-th perfect number A000396(n).

Table of values

n a(n)
1 236
2 472
3 134
4 618
5 483
6 618
7 251
8 122
9 122
10 361
11 811
12 811

List of values

[236, 472, 134, 618, 483, 618, 251, 122, 122, 361, 811, 811]

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

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