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.

A228575 Pseudoprimes n to base 2 such that n-4, n-2 and n+2 are primes.

Table of values

n a(n)
1 645
2 656601
3 6212361
4 18958567881
5 287468425245
6 626160901281
7 1395494019921
8 1925525109201
9 1960708164801
10 1962378065901
11 1977370759365
12 2788325761551
13 3032013857181
14 6877227801081
15 22298617759881
16 30242009317521
17 39454593651201
18 42401101442001

List of values

[645, 656601, 6212361, 18958567881, 287468425245, 626160901281, 1395494019921, 1925525109201, 1960708164801, 1962378065901, 1977370759365, 2788325761551, 3032013857181, 6877227801081, 22298617759881, 30242009317521, 39454593651201, 42401101442001]

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

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