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Search: id:A077497
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| A077497 |
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Primes of the form 2^r*5^s + 1. |
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+0
4
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| 2, 3, 5, 11, 17, 41, 101, 251, 257, 401, 641, 1601, 4001, 16001, 25601, 40961, 62501, 65537, 160001, 163841, 16384001, 26214401, 40960001, 62500001, 104857601, 167772161, 256000001, 409600001, 655360001, 2441406251, 2500000001
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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101 = 2^2*5^2 + 1 is a member.
62500=2*2*5*5*5*5*5*5 and 62500+1=A000040(6276), therefore 62501 is a member.
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CROSSREFS
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Cf. A003592, A077313, A019434.
Adjacent sequences: A077494 A077495 A077496 this_sequence A077498 A077499 A077500
Sequence in context: A007755 A060611 A103598 this_sequence A097048 A025067 A024371
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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 07 2002
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EXTENSIONS
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Corrected and extended by Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Nov 19 2002
More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 02 2003
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