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Search: id:A138759
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| A138759 |
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Indices for which A001203 (continued fraction for Pi) is prime. |
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+0
4
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| 1, 2, 9, 11, 14, 17, 18, 19, 20, 23, 27, 28, 31, 36, 37, 39, 40, 46, 48, 49, 50, 52, 59, 65, 70, 71, 72, 73, 75, 85, 86, 90, 93, 95, 97, 101, 102, 105, 106, 109, 110, 111, 118, 120, 122, 123, 124, 127, 128, 131, 132, 133, 140, 142, 145, 146, 151, 152, 153, 155, 159
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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k is in A138759 <=> A001203(k) is in A000040
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EXAMPLE
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This sequence starts 1,2,9,11,... since the 1st, 2nd, 9th, 11th...
term of sequence A001203 = (3, 7, 15, 1, 292, 1, 1, 1, 2, ...) are primes.
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PROGRAM
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(PARI) default(realprecision, 1000); t=contfrac(Pi); for( k=1, #t, isprime(t[k]) & print1(k", "))
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CROSSREFS
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Cf. A001203, A005042, A107892, A138758.
Sequence in context: A073634 A065554 A034042 this_sequence A098934 A043307 A049343
Adjacent sequences: A138756 A138757 A138758 this_sequence A138760 A138761 A138762
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KEYWORD
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nonn
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AUTHOR
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M. F. Hasler (www.univ-ag.fr/~mhasler), Mar 31 2008
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