[seqfan] A168022

[юрий герасимов]

if
A168022(non-composite numbers in the eastern ray of the Ulam spiral as oriented on the March iover of Scentific American) are 1, 2, 11, 53, 127, 233, 541, 743, 977, 1871, 3511,..
then 
A_____? = (2^n)-th numbers in the eastem ray of the Ulam spiral as oriented on the March iover of Scientific American = 2, 11, 53, 233, 977, 4001, 16193, 65153, 261377, 1047041, 4191233, 16771073, 67096577, 268410881, 1073692673, 4294868993, 171796725577, 68719083521, 274877120513, 1099507957763, 4398043365377, 17592179752961, 70368731594753, 281474951544833,...
or A         ? = (numbers n such that 4^(n + 1) - 3*2^n + 1 is prime) =  0, 1, 2, 3, 4, 5, 6, 8, 9, 14, 16, a(11) = ?, a(12) = ?, a(13) = ?  
Dear Segfans, 
help calculat the number o this sequence by computer.
Regards, Juri-Stepan Gerasimov