1,2

For n = 1 2*P(1)+3=2*2+3=7 prime so a(1)=1 as P(1)=2

For n=2 2*P(3)+3=2*5+3=13 prime, 2*P(4)+3=2*7+3=17 prime consecutive to 13 so a(2)=3 as P(3)=5

Cf. A089009.

Adjacent sequences: A102808 A102809 A102810 this_sequence A102812 A102813 A102814

Sequence in context: A046946 A092545 A011916 this_sequence A103980 A101236 A117960

hard,nonn

Pierre CAMI (pierrecami(AT)tele2.fr), Feb 26 2005