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1, 1, 1, 1, 2, 10, 12, 10, 21, 25, 70, 670, 239, 2115, 586, 1619, 26800, 2505, 99019, 40903, 285641, 67166, 1852765
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,5
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COMMENTS
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The first 23 terms were found using gwnum, and the first 22 have been independently checked using gmp.
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LINKS
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Table of n, a(n) for n=1..23.
Mersenne Forum, A071580
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PROG
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(PARI) terms=12; p=2; for(n=2, terms, q=p+1; while(!ispseudoprime(q), q=q+p); print1(q\p, ", "); p=p*q) \\ Serge Batalov, May 19 2015
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CROSSREFS
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Cf. A061092, A072532, A113334.
Sequence in context: A008560 A188283 A174703 * A300907 A327793 A276103
Adjacent sequences: A258078 A258079 A258080 * A258082 A258083 A258084
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KEYWORD
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nonn,hard,more
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AUTHOR
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Andrew R. Booker, May 19 2015
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STATUS
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approved
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