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.

A261364 Semiprimes that are the concatenation of n 1's, 2^n and n 1's.

Table of values

n a(n)
1 121
2 1118111
3 1111161111
4 11111164111111
5 111111111512111111111
6 1111111111114096111111111111
7 111111111111181921111111111111
8 111111111111111638411111111111111
9 111111111111111111262144111111111111111111
10 11111111111111111111104857611111111111111111111

List of values

[121, 1118111, 1111161111, 11111164111111, 111111111512111111111, 1111111111114096111111111111, 111111111111181921111111111111, 111111111111111638411111111111111, 111111111111111111262144111111111111111111, 11111111111111111111104857611111111111111111111]

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

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