id:A129545 - OEIS Search Results

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Triangular numbers T such that T+1 is a prime.

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1, 6, 10, 28, 36, 66, 78, 136, 190, 210, 276, 378, 630, 820, 946, 990, 1128, 1326, 1596, 1830, 2016, 2080, 2346, 2556, 2850, 2926, 3570, 3916, 4560, 4656, 4950, 5050, 5778, 6216, 6328, 8646, 8778, 9180, 9870, 11026, 12720, 13366, 14028, 14196, 14878 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The only triangular numbers T such that T-1 is a (positive) prime are 3 and 6.`
	FORMULA	`a(n) = A000217(A067186(n)) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 10 2007`
	CROSSREFS	`Cf. A000217, A129755, A130178.` `Sequence in context: A077621 A081394 A014494 this_sequence A097578 A103767 A025129` `Adjacent sequences: A129542 A129543 A129544 this_sequence A129546 A129547 A129548`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), May 30 2007`

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

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