A129307 - OEIS

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A129307

Intersection of A000217 and A005098.

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; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`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: A063231 A030005 A192163 * A186575 A020330 A023861` `Adjacent sequences: A129304 A129305 A129306 * A129308 A129309 A129310`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), May 26 2007`

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Last modified February 16 06:27 EST 2012. Contains 205860 sequences.