cp's OEIS Frontend

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.

A138816 Concatenation of initial digit of n-th Mersenne prime A000668(n), initial digit of n-th even superperfect number A061652(n) and initial digit of n-th perfect number A000396(n).

Table of values

n a(n)
1 326
2 742
3 314
4 168
5 843
6 168
7 521
8 212
9 212
10 631
11 181
12 181
13 632
14 521
15 155

List of values

[326, 742, 314, 168, 843, 168, 521, 212, 212, 631, 181, 181, 632, 521, 155]

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

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