id:A109020 - OEIS Search Results

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(2*7^n - 3*3^n + 1)/6.

+0
2

0, 1, 12, 101, 760, 5481, 38852, 273421, 1918320, 13441361, 94128892, 659020341, 4613496680, 32295539641, 226071966132, 1582513328861, 11077621999840, 77543440092321, 542804338926572, 3799631147326981, 26597420355811800, 186181949464251401, 1303273667170466212 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Number of incongruent integer-edged Heron triangles whose circumdiameter is the product of n distinct primes of shape 4k + 1.`
	CROSSREFS	`Sequence in context: A085374 A016283 A008547 this_sequence A099299 A022736 A082151` `Adjacent sequences: A109017 A109018 A109019 this_sequence A109021 A109022 A109023`
	KEYWORD	`nonn`
	AUTHOR	`Alex Fink and R. K. Guy, Aug 18 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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