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A063644 Primes with 2 representations: p*q*r - 1 = u*v*w + 1 where p, q, r, u, v and w are primes. +0
1
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)
OFFSET

1,1

EXAMPLE

A063644(20) = 4723: 4723 = A063639(168)= 4724 - 1 = 2*2*1181 - 1, 4723 = A063640(158)= 4722 + 1 = 2*3*787+ 1.

CROSSREFS

A063639, A063640, A014612.

Sequence in context: A108183 A096218 A046120 this_sequence A092600 A050266 A106124

Adjacent sequences: A063641 A063642 A063643 this_sequence A063645 A063646 A063647

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 21 2001

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Last modified August 28 19:25 EDT 2008. Contains 143183 sequences.


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