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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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4
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2, 23, 31, 35, 124, 323, 2787, 5717, 6506, 8980, 106817
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| The first 23 binary digits of Pi (A004601) are 11001001000011111101101 = 6588397 in decimal, which is a prime.
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MATHEMATICA
| Do[ If[ PrimeQ[ FromDigits[ First[ RealDigits[Pi, 2, n]], 2]], Print[n]], {n, 1, 7000} ]
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CROSSREFS
| Cf. A004601, A117721 (the primes themselves).
Sequence in context: A090150 A106102 A053232 * A107153 A049544 A049568
Adjacent sequences: A065984 A065985 A065986 * A065988 A065989 A065990
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KEYWORD
| base,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 10 2001
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EXTENSIONS
| 8980 from Hans Havemann, Jul 23, 2006
106817 from Hans Havermann (gladhobo(AT)teksavvy.com), Sep 06 2006
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