1,2

Numbers in A089001 or in A066049 but not in both. [From R. J. Mathar, Mar 09 2010]

Table of n, a(n) for n=1..65.

a(1)=1 because 2*1^2-1=1 is nonprime and 2*1^2+1=3 is prime.

Sequence in context: A141745 A301936 A285535 * A103254 A299419 A083454

Adjacent sequences: A173413 A173414 A173415 * A173417 A173418 A173419

nonn

Juri-Stepan Gerasimov, Mar 01 2010

37 removed by R. J. Mathar, Mar 09 2010

approved