1,1
Table of n, a(n) for n=1..4.
A000040 INTERSECT A002253. - R. J. Mathar, Jan 04 2011
For p=2, 3*2^2+1=13; p=5. 3*2^5+1=97; p=41, 3*2^41+1=6597069766657
(MAGMA) [p: p in PrimesUpTo(4000) | IsPrime(3*2^p+1) ]
Sequence in context: A185052 A088547 A009457 * A218057 A126469 A054859
Adjacent sequences: A175169 A175170 A175171 * A175173 A175174 A175175
nonn
Vincenzo Librandi, Mar 09 2010
approved
