|
| |
|
|
A138759
|
|
Indices for which A001203 (continued fraction for Pi) is prime.
|
|
4
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
FORMULA
| k is in A138759 <=> A001203(k) is in A000040
|
|
|
EXAMPLE
| This sequence starts 1,2,9,11,... since the first, 2nd, 9th, 11th...
term of sequence A001203 = (3, 7, 15, 1, 292, 1, 1, 1, 2, ...) are primes.
|
|
|
PROG
| (PARI) default(realprecision, 1000); t=contfrac(Pi); for( k=1, #t, isprime(t[k]) & print1(k", "))
|
|
|
CROSSREFS
| Cf. A001203, A005042, A107892, A138758.
Sequence in context: A073634 A065554 A034042 * A098934 A043307 A049343
Adjacent sequences: A138756 A138757 A138758 * A138760 A138761 A138762
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| M. F. Hasler (www.univ-ag.fr/~mhasler), Mar 31 2008
|
| |
|
|
