id:A129307 - OEIS Search Results

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Intersection of A000217 and A005098.

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1, 3, 10, 15, 28, 45, 78, 105, 153, 190, 253, 300, 325, 435, 465, 528, 595, 630, 780, 903, 1128, 1275, 1830, 2145, 2415, 2485, 2628, 3160, 3403, 3570, 3655, 3828, 4095, 4753, 4950, 5050, 5253, 5460, 5995, 6105, 6670, 7503, 8515, 9180, 9453, 9730, 10440 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Triangular numbers T(m)=m(m+1)/2 indices m of which are in A027861. T(m) such that m^2+(m+1)^2 is prime.`
	FORMULA	`a(n)=A027861(n)(A027861(n)+1)/2; a(n)=T(A027861(n))=A000217(A027861(n)).`
	CROSSREFS	`Cf. A000217, A005098, A027861.` `Sequence in context: A077759 A063231 A030005 this_sequence A020330 A023861 A037345` `Adjacent sequences: A129304 A129305 A129306 this_sequence A129308 A129309 A129310`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), May 26 2007`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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