[seqfan] Numbers NOT of the form 2^x - y^2

Alonso Del Arte alonso.delarte at gmail.com
Tue Oct 7 06:38:05 CEST 2014

A sequence from Juri-Stepan raises for me a question I find very
interesting: how can you be absolutely sure a number is NOT of the form 2^x
- y^2 ? The answer would also be relevant for the supersequence, A051213.

Since Juri's subsequence consists of the prime numbers of the form, I had
the foggy notion that Legendre's symbol is relevant, but I can't figure out
if I'm on the right track with that.


Alonso del Arte
Author at SmashWords.com
Musician at ReverbNation.com <http://www.reverbnation.com/alonsodelarte>

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