Yes, the sequence already has this. Alois Am 20.08.2013 20:57, schrieb Jack Brennen: > Wouldn't the sequence S go like this? > > S=1,3,2,9,5,21,4,7,6,13,10,19,16,27,8,11,15,23,12,17,20,29, > 14,33,26,47,... > > which deviates from the sequence below after the 29 term. > > After all, 1429 is prime. >