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A081779 Ordered m for which m = k^3*a*b*(a^4 - b^4) determine (unique) solution triples(k,a,b), where k=1,2,3,... and (a,b) are coprime pairs,not both odd (i.e. of opposite parity). +0
1
30, 240, 390, 810, 1020, 1920, 2100, 3120, 3750, 6090, 6480, 7380, 7770, 8160, 10290, 10530, 15360, 16800, 21030, 21870, 24960, 27540, 30000, 32760, 33390, 46410, 48720, 48750, 51840, 56700, 59040, 60060, 62660 (list; graph; listen)
OFFSET

1,1

COMMENT

Also called Saint-Exupery numbers.

LINKS

N. des Vallieres and F. D'Agay, Le Probleme du Pharaon

FORMULA

a(n)=A057096(n)/2.

CROSSREFS

Cf. A057096.

Sequence in context: A156372 A064241 A080569 this_sequence A069487 A008385 A061167

Adjacent sequences: A081776 A081777 A081778 this_sequence A081780 A081781 A081782

KEYWORD

nice,nonn

AUTHOR

Lekraj Beedassy (blekraj(AT)yahoo.com), Apr 10 2003

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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