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A139286 a(n) = 2^(2*prime(n) - 1). 12
8, 32, 512, 8192, 2097152, 33554432, 8589934592, 137438953472, 35184372088832, 144115188075855872, 2305843009213693952, 9444732965739290427392, 2417851639229258349412352, 38685626227668133590597632, 9903520314283042199192993792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

MATHEMATICA

2^(2Prime[Range[20]]-1) (* Harvey P. Dale, Dec 01 2017 *)

PROG

(MAGMA)[2^(2*p-1): p in PrimesUpTo(200)] // Vincenzo Librandi, Dec 15 2010

(PARI) a(n)=2^(2*prime(n)-1) \\ Charles R Greathouse IV, Jul 02 2013

CROSSREFS

Cf. A000040, A000079, A076274, A139287, A139288, A139289, A139290, A139291, A139292, A139293, A139294, A139306.

Sequence in context: A140789 A120781 A288454 * A139306 A214594 A288457

Adjacent sequences:  A139283 A139284 A139285 * A139287 A139288 A139289

KEYWORD

nonn,less

AUTHOR

Omar E. Pol, Apr 13 2008

EXTENSIONS

Corrected and extended by Harvey P. Dale, Dec 01 2017

STATUS

approved

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Last modified March 21 22:19 EDT 2019. Contains 321382 sequences. (Running on oeis4.)