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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.

A065845 Let u be any string of n digits from {0,...,3}; let f(u) = number of distinct primes, not beginning with 0, formed by permuting the digits of u to a base-4 number; then a(n) = max_u f(u).

Table of values

n a(n)
1 1
2 2
3 3
4 6
5 13
6 36
7 96
8 253
9 765
10 2683
11 7385
12 25075
13 83150
14 293063
15 888689
16 3161645
17 11097301
18 40328876
19 129951350
20 469528189
21 1694632516

List of values

[1, 2, 3, 6, 13, 36, 96, 253, 765, 2683, 7385, 25075, 83150, 293063, 888689, 3161645, 11097301, 40328876, 129951350, 469528189, 1694632516]

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

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