id:A081115 - OEIS Search Results

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(p^2-1)/12 where p runs through the primes of the form 4k+1.

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2, 4, 10, 14, 24, 30, 44, 70, 80, 114, 140, 154, 184, 234, 290, 310, 374, 420, 444, 520, 574, 660, 784, 850, 884, 954, 990, 1064, 1344, 1430, 1564, 1610, 1850, 1900, 2054, 2214, 2324, 2494, 2670, 2730, 3040, 3104, 3234, 3300, 3710, 4144, 4294, 4370, 4524 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Hojoo Lee, Problems in Elementary Number Theory, p. 13, problem 10.`
	FORMULA	`If p=4k+1, (p^2-1)/12=sum(i=1, k, floor(sqrt(ik)))` `a(n)=j(j+1)/3 where A000040(n+2)=2*j+1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 07 2006`
	CROSSREFS	`Sequence in context: A082230 A107992 A139480 this_sequence A053417 A078775 A056392` `Adjacent sequences: A081112 A081113 A081114 this_sequence A081116 A081117 A081118`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 16 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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