0

Table of n, a(n) for n=0..90.

Ian R Harris, Sprimes: A Sparse Prime-Like Sequence of Natural Numbers Generated by the Goldbach Conjecture, Technical report TR-375.

a(1) = 1 because 2*1+1 = 3 is Sprime;

a(2) = 0 because 2*2+1 = 5 is not Sprime;

a(3) = 1 because 2*3+1 = 7 is Sprime;

a(4) = 0 because 2*4+1 = 9 is not Sprime.

Cf. A193258, A101264.

Sequence in context: A087429 A093075 A104120 * A108336 A279733 A176723

Adjacent sequences: A254631 A254632 A254633 * A254635 A254636 A254637

nonn

Ian R Harris, Feb 03 2015

Terms a(58) and beyond from Andrew Howroyd, Dec 23 2019

approved