1,3

(PARI) for(x=0, 1000, if(isprime(2^(2*x)-(2*x-1)), print1(x, ", ")))

Sequence in context: A098506 A085453 A030439 this_sequence A140484 A087034 A133165

Adjacent sequences: A119383 A119384 A119385 this_sequence A119387 A119388 A119389

nonn

Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Jul 25 2006