id:A083676 - OEIS Search Results

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Triangular numbers whose sum of aliquot divisors is a prime number.

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21, 55, 171, 325, 595, 741, 1081, 1711, 2485, 3081, 3655, 7021, 11325, 13861, 14365, 15931, 23005, 23653, 23871, 29403, 31375, 32131, 44551, 45451, 48205, 52003, 53301, 60031, 65341, 65703, 67161, 74691, 81003, 87571, 92665, 108811, 110215 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Shyam Sunder Gupta, Fascinating Triangular Numbers.`
	EXAMPLE	`a(2)=55 because sum of aliquot divisors of 55=1+5+11=17, which is a prime number.`
	CROSSREFS	`Sequence in context: A007796 A144302 A067431 this_sequence A145719 A031963 A067727` `Adjacent sequences: A083673 A083674 A083675 this_sequence A083677 A083678 A083679`
	KEYWORD	`nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jun 15 2003`

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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

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