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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.

A138820 Concatenation of n-th even superperfect number, n-th Mersenne prime A000668(n) and n-th perfect number.

Table of values

n a(n)
1 236
2 4728
3 1631496
4 641278128
5 4096819133550336
6 655361310718589869056
7 262144524287137438691328
8 107374182421474836472305843008139952128
9 115292150460684697623058430092136939512658455991569831744654692615953842176

List of values

[236, 4728, 1631496, 641278128, 4096819133550336, 655361310718589869056, 262144524287137438691328, 107374182421474836472305843008139952128, 115292150460684697623058430092136939512658455991569831744654692615953842176]

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

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