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A119961 Semiprimes which are the sum of two triangular numbers. 0
4, 9, 10, 15, 21, 22, 25, 34, 38, 39, 46, 49, 51, 55, 57, 58, 65, 69 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Semiprime analogue of A117048 Prime numbers which are expressible as the sum of two triangular numbers.

FORMULA

A020756 intersection A001358.

CROSSREFS

Cf. A001358, A020756, A117048.

Sequence in context: A133764 A163643 A139558 * A110602 A122635 A191912

Adjacent sequences:  A119958 A119959 A119960 * A119962 A119963 A119964

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 02 2006

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Last modified February 15 18:22 EST 2012. Contains 205835 sequences.