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A077497
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Primes of the form 2^r*5^s + 1.
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8
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Ray Chandler, Table of n, a(n) for n = 1..3150
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EXAMPLE
| 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
| Cf. A005109, A077497, A077498, A077500, A003592, A077313, A019434.
Sequence in context: A007755 A060611 A103598 * A178606 A097048 A057652
Adjacent sequences: A077494 A077495 A077496 * A077498 A077499 A077500
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KEYWORD
| nonn,changed
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 07 2002
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EXTENSIONS
| Corrected and extended by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 19 2002
More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 02 2003
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