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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.

A257917 a(n) is the largest y that is a member of a pair (x, y) of integers with x - y > 1 such that x^2 - y^2 is equal to the Fermat number 2^(2^n) + 1, or 0 if no such number exists.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 3349888
6 33640210518272
7 2852314775548000778752
8 46730819857678988884581779099803448292025618770199631109363712

List of values

[0, 0, 0, 0, 0, 3349888, 33640210518272, 2852314775548000778752, 46730819857678988884581779099803448292025618770199631109363712]

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

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