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.

A056698 Numbers k such that 10^k + 3*R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k.

Table of values

n a(n)
1 1
2 15
3 41
4 83
5 95
6 341
7 551
8 669
9 989
10 1223
11 6923
12 103703

List of values

[1, 15, 41, 83, 95, 341, 551, 669, 989, 1223, 6923, 103703]

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

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