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7, 13, 19, 55, 103, 121, 127, 163, 253, 391, 721, 793, 1063, 1441, 2719, 3313, 9595, 13045, 17863, 21889, 46243, 49891
(list;
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listen;
history;
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OFFSET
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1,1
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COMMENTS
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Primes in this sequence are 7, 13, 19, 103, 127,163, ....
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LINKS
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Table of n, a(n) for n=1..22.
Dario Alpern, Factorization using the Elliptic Curve Method
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FORMULA
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a(n)=1+6*A056658(n). [From R. J. Mathar, Sep 25 2009]
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EXAMPLE
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The digit sum of 6666666666666666666666666666666666666666661 is 253.
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CROSSREFS
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Cf. A056658, A092571
Sequence in context: A109558 A108106 A231506 * A144232 A154756 A024732
Adjacent sequences: A165721 A165722 A165723 * A165725 A165726 A165727
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KEYWORD
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base,nonn
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AUTHOR
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Parthasarathy Nambi, Sep 25 2009
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EXTENSIONS
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More terms from R. J. Mathar, Sep 25 2009
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STATUS
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approved
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