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Search: id:A077313
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| A077313 |
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Primes of the form 2^r*5^s - 1. |
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+0
5
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| 3, 7, 19, 31, 79, 127, 199, 499, 1249, 1279, 1999, 4999, 5119, 8191, 12799, 20479, 31249, 49999, 51199, 79999, 81919, 131071, 199999, 524287, 799999, 1249999, 1310719, 3124999, 3276799, 4999999, 7812499, 12499999, 19999999, 20479999
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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1250000=2*2*2*2*5*5*5*5*5*5*5 and 1250000-1=A000040(96469), therefore 1249999 is a term.
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CROSSREFS
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Cf. A023509, A003592.
Sequence in context: A066148 A093932 A141173 this_sequence A102271 A112633 A113916
Adjacent sequences: A077310 A077311 A077312 this_sequence A077314 A077315 A077316
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 04 2002
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EXTENSIONS
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More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Nov 15 2002
More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), May 08 2003
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