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Search: id:A117464
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A117464 Triangular numbers for which the product of the digits is a square. +0
1
0, 1, 10, 28, 55, 66, 91, 105, 120, 190, 210, 300, 406, 595, 630, 703, 780, 820, 903, 990, 1035, 1081, 1128, 1326, 1540, 1770, 1830, 2016, 2080, 2211, 2346, 2701, 2850, 3003, 3081, 3160, 3240, 3403, 3486, 3570, 4005, 4095, 4560, 4950, 5050, 5151, 5460, 5995 (list; graph; listen)
OFFSET

0,3

EXAMPLE

3486 is in the sequence because (1) it is a triangular number and (2) the product of its digits 3*4*8*6=576 is a square.

CROSSREFS

Cf. A000217.

Sequence in context: A088407 A069953 A113746 this_sequence A081273 A060544 A088406

Adjacent sequences: A117461 A117462 A117463 this_sequence A117465 A117466 A117467

KEYWORD

base,nonn

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), Apr 26 2006

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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