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A121290 a(n) = (2^prime(n) - 8)/24 for n>=2. 2
0, 1, 5, 85, 341, 5461, 21845, 349525, 22369621, 89478485, 5726623061, 91625968981, 366503875925, 5864062014805, 375299968947541, 24019198012642645, 96076792050570581, 6148914691236517205 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Previous name was: (2^(p-3) - 1)/3, where p is an odd prime, i.e., p = A065091.

LINKS

Table of n, a(n) for n=1..18.

MATHEMATICA

Table[(2^Prime[n] - 8)/24, {n, 2, 100}] (* Artur Jasinski *)

CROSSREFS

Cf. A000043, A000668, A124477, A139479, A139480.

Sequence in context: A216420 A137083 A198586 * A201797 A012743 A139744

Adjacent sequences:  A121287 A121288 A121289 * A121291 A121292 A121293

KEYWORD

nonn,easy,less

AUTHOR

Lekraj Beedassy, Aug 24 2006

EXTENSIONS

New name from Joerg Arndt, Jul 21 2017

STATUS

approved

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Last modified July 18 06:19 EDT 2019. Contains 325134 sequences. (Running on oeis4.)