id:A076207 - OEIS Search Results

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Triangular numbers whose sum of primes from smallest to largest prime factor is triangular and whose sum of composites from smallest to largest prime factor is triangular.

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3, 21, 105, 325, 7875, 9568125 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`No more terms < 2.77*10^12. - David Wasserman (wasserma(AT)spawar.navy.mil), Jul 20 2005`
	EXAMPLE	`325 = 5^2*13, sum of primes between: 5+7+11+13 = 36, triangular; sum of composites between: 6+8+9+10+12 = 45, triangular.`
	CROSSREFS	`Cf. A000217, A074036, A074037.` `Sequence in context: A069017 A144883 A074597 this_sequence A134057 A128281 A034268` `Adjacent sequences: A076204 A076205 A076206 this_sequence A076208 A076209 A076210`
	KEYWORD	`more,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Nov 02 2002`

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

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