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-1, 1, 11, 55, 239, 991, 4031, 16255, 65279, 261631, 1047551, 4192255, 16773119, 67100671, 268419071, 1073709055, 4294901759, 17179738111, 68719214591, 274877382655, 1099510579199, 4398044413951, 17592181850111, 70368735789055
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Sequence A098845 lists indices of primes, i.e. a(n) prime <=> n=A098845(k) for some k.
Starting with n=2 binary numbers of the form (n-1)0(n) where n is the index and the number of 1's. It can also be formed by appending a 1 to the right of each term of A129868
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PROG
| (PARI) vector(99, n, 4^n-2^n-1)
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CROSSREFS
| Sequence in context: A022606 A072025 A098992 * A165791 A032166 A099532
Adjacent sequences: A156586 A156587 A156588 * A156590 A156591 A156592
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KEYWORD
| sign
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AUTHOR
| M. F. Hasler (www.univ-ag.fr/~mhasler), Feb 10 2009
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