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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.

A091418 Integers n which are not the sum or difference of 2 integers A and B where A is less than or equal to n such that AB+1 and AB-1are both primes. In other words, the product A*B cannot be the middle integer of a twin prime pair.

Table of values

n a(n)
1 10
2 15
3 20
4 30
5 40
6 60
7 75
8 100
9 120
10 250
11 315
12 390
13 540
14 630

List of values

[10, 15, 20, 30, 40, 60, 75, 100, 120, 250, 315, 390, 540, 630]

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

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