A076207 - OEIS

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A076207

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.

3, 21, 105, 325, 7875, 9568125 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	COMMENTS	`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 * A134057 A128281 A034268` `Adjacent sequences: A076204 A076205 A076206 * A076208 A076209 A076210`
	KEYWORD	`more,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Nov 02 2002`

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Last modified February 17 02:08 EST 2012. Contains 205978 sequences.