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Search: id:A065987
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| A065987 |
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Numbers n such that the first n binary digits of Pi expressed in decimal forms a prime. |
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+0
5
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| 2, 23, 31, 35, 124, 323, 2787, 5717, 6506, 8980, 106817
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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The first 23 binary digits of Pi (A004601) are 11001001000011111101101 = 6588397 in decimal, which is a prime.
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MATHEMATICA
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Do[ If[ PrimeQ[ FromDigits[ First[ RealDigits[Pi, 2, n]], 2]], Print[n]], {n, 1, 7000} ]
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CROSSREFS
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Cf. A004601, A117721 (the primes themselves).
Sequence in context: A090150 A106102 A053232 this_sequence A107153 A049544 A049568
Adjacent sequences: A065984 A065985 A065986 this_sequence A065988 A065989 A065990
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KEYWORD
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base,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 10 2001
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EXTENSIONS
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8980 from Hans Havemann, Jul 23, 2006
106817 from Hans Havermann (pxp(AT)rogers.com), Sep 06 2006
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