id:A129752 - OEIS Search Results

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Triangular numbers t which are average of two consecutive primes p and p+4.

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15, 21, 45, 105, 231, 351, 465, 741, 861, 1431, 1485, 3081, 3321, 4005, 7875, 10731, 11175, 11781, 13695, 14535, 17205, 17391, 18915, 21321, 22155, 23871, 30135, 33411, 36585, 39621, 42195, 51681, 58311, 80601, 90525, 92235, 97461, 108345 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`All terms are multiples of 3.`
	FORMULA	`t-/+2 are pair of consecutive primes.`
	EXAMPLE	`15-/+2=(13,17), 21-/+2=(19,23), 45-/+2=(43,47) are pairs of consecutive primes.`
	CROSSREFS	`Cf. A000217, A024675, A130178.` `Adjacent sequences: A129749 A129750 A129751 this_sequence A129753 A129754 A129755` `Sequence in context: A095147 A081977 A063175 this_sequence A015831 A063176 A083372`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), May 14 2007`

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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