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A128997
indices k such that A063670(k) differs from A005420(k).
0
11, 12, 15, 20, 21, 22, 23, 24, 25, 28, 29, 30, 33, 35, 36, 37, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96
OFFSET
1,1
COMMENTS
Primes in this sequence are those for which A005420(n) < 2^n-1, i.e. 2^n-1 is not prime.
PROG
(PARI) t=1; vector(100, i, until( A063670(t++) != A005420(t), ); t)
CROSSREFS
Sequence in context: A274566 A349153 A213309 * A189836 A292683 A139138
KEYWORD
nonn
AUTHOR
M. F. Hasler, Apr 30 2007
STATUS
approved