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Search: id:A019507
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A019507 Droll numbers: sum of even prime divisors equals sum of odd prime divisors, e.g. 6272 = 2 2 2 2 2 2 2 7 7 is droll since 2+...+2 = 14 = 7+7. +0
2
72, 240, 672, 800, 2240, 4224, 5184, 6272, 9984, 14080, 17280, 33280, 39424, 48384, 52224, 57600, 93184, 116736, 161280, 174080, 192000, 247808, 304128, 373248, 389120, 451584, 487424, 537600, 565248, 585728, 640000, 718848 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Sequence in context: A077535 A064716 A073412 this_sequence A158488 A165139 A004007

Adjacent sequences: A019504 A019505 A019506 this_sequence A019508 A019509 A019510

KEYWORD

nonn

AUTHOR

Mario Velucchi (mathchess(AT)velucchi.it)

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

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