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Search: id:A139291
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| A139291 |
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(2^(2p - 1)/4)-1, where p is the n-th prime. |
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+0
7
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| 1, 7, 127, 2047, 524287, 8388607, 2147483647, 34359738367, 8796093022207, 36028797018963967, 576460752303423487, 2361183241434822606847, 604462909807314587353087, 9671406556917033397649407
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OFFSET
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1,2
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FORMULA
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a(n)=(A139286(n)/4)-1.
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CROSSREFS
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Cf. A139286, A139287, A139288, A139289, A139290, A139291, A139293, A139294, A139306.
Sequence in context: A088550 A064754 A025166 this_sequence A092676 A002067 A138523
Adjacent sequences: A139288 A139289 A139290 this_sequence A139292 A139293 A139294
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Apr 13 2008
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EXTENSIONS
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Edited by Max Alekseyev (maxale(AT)gmail.com), May 03 2009
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