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A074926 Numbers n such that p(n)*p(n+1)+4 is a square. +0
1
2, 11, 18, 40, 47, 51, 74, 76, 91, 96, 97, 105, 108, 164, 185, 203, 205, 208, 227, 238, 243, 252, 271, 291, 312, 321, 349, 351, 362, 374, 392, 396, 406, 420, 438, 449, 453, 523, 529, 541, 562, 576, 590, 602, 629, 639, 641, 668, 679, 698, 711, 720, 734, 752 (list; graph; listen)
OFFSET

1,1

COMMENT

Primes of form pq+4 where p and q are consecutive primes are in A063442.

EXAMPLE

p(11)*p(12) + 4 = 37*41+4 = 1151 -> prime.

CROSSREFS

Cf. A063442.

Sequence in context: A043461 A030551 A121848 this_sequence A066144 A102343 A023173

Adjacent sequences: A074923 A074924 A074925 this_sequence A074927 A074928 A074929

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Oct 02 2002

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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