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A083676 Triangular numbers whose sum of aliquot divisors is a prime number. 0
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; refs; listen; history; internal format)
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: A144302 A180674 A067431 * A145719 A031963 A067727

Adjacent sequences:  A083673 A083674 A083675 * A083677 A083678 A083679

KEYWORD

nonn

AUTHOR

Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jun 15 2003

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Last modified February 14 14:07 EST 2012. Contains 205623 sequences.