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A139314
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Primes of the form 2^(2p - 1) - 1, where p is prime.
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OFFSET
| 1,1
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COMMENTS
| Primes in A139287.
This sequence is a subsequence of A000668. From A000043, a(5) = 2^3217 - 1.
The next term a(6) is an unknown Mersenne prime. [From W. Bomfim (webonfim(AT)bol.com.br), Nov 18 2009]
a(5) has 969 digits. [From V. Librandi Dec 14 2010]
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LINKS
| Wikipedia, Mersenne prime [From W. Bomfim (webonfim(AT)bol.com.br), Nov 18 2009]
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PROG
| (MAGMA)[a: p in PrimesUpTo(4200)|IsPrime(a) where a is 2^(2*p-1)-1][From Vincenzo Librandi, Dec 14 2010]
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CROSSREFS
| Cf. A139286, A139287.
Cf. A000668, A000043. [From W. Bomfim (webonfim(AT)bol.com.br), Nov 18 2009]
Sequence in context: A197301 A191297 A134709 * A163083 A101329 A193637
Adjacent sequences: A139311 A139312 A139313 * A139315 A139316 A139317
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KEYWORD
| more,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Apr 13 2008
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