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Search: id:A063639
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| A063639 |
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Primes of form p*q*r - 1, where p, q and r are primes. |
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+0
4
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| 7, 11, 17, 19, 29, 41, 43, 67, 97, 101, 109, 113, 137, 163, 173, 181, 211, 229, 241, 257, 281, 283, 317, 331, 337, 353, 373, 401, 409, 433, 523, 547, 577, 601, 617, 641, 653, 677, 691, 709, 761, 787, 821, 829, 853, 907, 937, 941, 977, 1009, 1021, 1033, 1051
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROGRAM
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(PARI) { n=0; for (m=1, 10^9, p=prime(m); if (bigomega(p + 1) == 3, write("b063639.txt", n++, " ", p); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 26 2009]
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CROSSREFS
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A014612, A063640.
Sequence in context: A038880 A019365 A078497 this_sequence A131229 A092737 A072669
Adjacent sequences: A063636 A063637 A063638 this_sequence A063640 A063641 A063642
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 21 2001
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