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A101087 Indices of prime values of A077020 (also A001607). 0
4, 6, 7, 8, 9, 10, 11, 15, 17, 19, 23, 25, 26, 29, 31, 47, 53, 65, 67, 71, 73, 113, 127, 199, 257, 349, 421, 433, 449, 691, 761, 823, 991, 1237, 1277, 1399, 1531, 1571, 3461, 3697, 4933, 6199, 7351 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

There are only 9 composites numbers in the entire sequence, namely: 4, 6, 8, 9, 10, 15, 25, 26 and 65.

If we are prepared to accept probable primes, then the sequence continues as follows: 9551, 9719, 11681, 12037, 14629, 14951, 19079, 20327, 22549, 30517, 51511, 52813, 60923, 73943, 79687, 91249, 115321, 117017, 169493, 172411, 174413, 237053, 285631, 318751, 327433 - David Broadhurst, May 23 2007

LINKS

Table of n, a(n) for n=1..43.

G. P. Michon, Never Back to -1.

CROSSREFS

Cf. A001607, A077020 (all values) and A101088 (prime values only). Similar to A001605 (Fibonacci primes), A000043 (Mersenne primes), A096650 (Pell primes), etc.

Sequence in context: A123860 A122817 A074764 * A138887 A216845 A031949

Adjacent sequences:  A101084 A101085 A101086 * A101088 A101089 A101090

KEYWORD

nonn

AUTHOR

Gerard P. Michon, Dec 01 2004

STATUS

approved

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Last modified June 28 11:48 EDT 2017. Contains 288822 sequences.