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A139290
2^(2p - 1)/4, where p is prime.
9
2, 8, 128, 2048, 524288, 8388608, 2147483648, 34359738368, 8796093022208, 36028797018963968, 576460752303423488, 2361183241434822606848, 604462909807314587353088, 9671406556917033397649408
OFFSET
1,1
FORMULA
a(n) = A139286(n)/4.
MATHEMATICA
2^(2#-1)/4 & /@ Prime@ Range@ 15 (* Harvey P. Dale, Dec 16 2010 *)
PROG
(Magma) [2^(2*p-1)div 4: p in PrimesUpTo(200)] // Vincenzo Librandi, Dec 15 2010
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 13 2008
EXTENSIONS
More terms from Jon E. Schoenfield, Jul 16 2010
STATUS
approved