[seqfan] Sum of any pair of primes (or non-primes) is not in S

[Eric Angelini]

Hello SeqFans,
The sum of any pair of primes is not 
in the sequence S (if I'm not wrong):

S=1,2,3,4,6,7,8,11,12,15,16,17,21,22,
23,27,29,33,35,37,38,41,...

Similarily, the sum of any pair of non-primes 
is not in the sequence T:

T=1,2,3,4,6,8,11,13,15,17,18,20,25,27,30,32,37,39,41,44,...

Best,
É.