1,2
a(4) = 8 since A037028(3) = 19 and 19 = the 8-th prime.
a(5) = 16 since A037028(4) = 53 and 53 = the 16-th prime.
Cf. A037028.
Sequence in context: A180207 A013025 A034339 * A085294 A195327 A034340
Adjacent sequences: A126134 A126135 A126136 * A126138 A126139 A126140
nonn
Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 18 2006