A254634 - OEIS

A254634

a(n) = 1 if 2*n + 1 is Sprime (A193258), else a(n) = 0.

1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0

(list; graph; refs; listen; history; text; internal format)

OFFSET

LINKS

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.

EXAMPLE

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.

CROSSREFS

Cf. A193258, A101264.