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A107036
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Indices of prime Jacobsthal numbers.
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7
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3, 4, 5, 7, 11, 13, 17, 19, 23, 31, 43, 61, 79, 101, 127, 167, 191, 199, 313, 347, 701, 1709, 2617, 3539, 5807, 10501, 10691, 11279, 12391, 14479, 42737, 83339, 95369, 117239, 127031, 138937, 141079, 267017, 269987, 374321
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OFFSET
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0,1
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COMMENTS
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All a(n) are prime except a(1) = 4. All prime a(n) are listed in A000978[n] = {3,5,7,11,13,17,19,23,31,43,61,79,101,127,167,...} Numbers n such that (2^n + 1)/3 is prime. - Alexander Adamchuk, Oct 03 2006
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LINKS
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Table of n, a(n) for n=0..39.
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FORMULA
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a(n) = A000978[n] for n>1. - Alexander Adamchuk, Oct 03 2006
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CROSSREFS
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Cf. A000978, A001045, A001605.
Sequence in context: A046642 A140826 A081735 * A001605 A216570 A101762
Adjacent sequences: A107033 A107034 A107035 * A107037 A107038 A107039
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KEYWORD
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nonn
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AUTHOR
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Paul Barry, May 09 2005
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EXTENSIONS
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More terms from Alexander Adamchuk, Oct 03 2006
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STATUS
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approved
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