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A109504 Chen primes p such that p + 2 is triangular. 0
13, 19, 53, 89, 251, 701, 1709, 1889, 2699, 5669, 12401, 13859, 18719, 38501, 49139, 60029, 104651, 114479, 146609, 158201, 188189, 226799, 258119, 371951, 385001, 497501, 597869, 665279, 954269, 1034639, 1159001, 1309769, 1660751, 1869209 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

a(9)=2699 because it is prime and 2701 = 37*73 and 73*74/2 = 2701.

CROSSREFS

Cf. A109611.

Sequence in context: A174152 A156940 A180528 * A122042 A174343 A158332

Adjacent sequences:  A109501 A109502 A109503 * A109505 A109506 A109507

KEYWORD

easy,nonn

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Aug 29 2005

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Last modified February 17 12:38 EST 2012. Contains 206021 sequences.