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Search: id:A063644
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| A063644 |
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Primes with 2 representations: p*q*r - 1 = u*v*w + 1 where p, q, r, u, v and w are primes. |
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+0
1
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| 19, 29, 43, 67, 173, 283, 317, 653, 787, 907, 1867, 2083, 2693, 2803, 3413, 3643, 3677, 4253, 4363, 4723, 5443, 5717, 6197, 6547, 6653, 8563, 8573, 9067, 9187, 9403, 9643, 10733, 11443, 11587, 12163, 12917, 13997, 14107, 14683, 15187, 17827
(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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EXAMPLE
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A063644(20) = 4723: 4723 = A063639(168)= 4724 - 1 = 2*2*1181 - 1, 4723 = A063640(158)= 4722 + 1 = 2*3*787+ 1.
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PROGRAM
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(PARI) { n=0; default(primelimit, 2000000); for (m=2, 10^9, p=prime(m); if (bigomega(p + 1) == 3 && bigomega(p - 1) == 3, write("b063644.txt", n++, " ", p); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 27 2009]
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CROSSREFS
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A063639, A063640, A014612.
Adjacent sequences: A063641 A063642 A063643 this_sequence A063645 A063646 A063647
Sequence in context: A157483 A096218 A046120 this_sequence A156782 A092600 A050266
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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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