login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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
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; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also called Saint-Exupery numbers.

LINKS

Table of n, a(n) for n=1..33.

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

FORMULA

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

CROSSREFS

Cf. A057096.

Sequence in context: A185032 A190068 A196412 * A069487 A008385 A061167

Adjacent sequences:  A081776 A081777 A081778 * A081780 A081781 A081782

KEYWORD

nice,nonn

AUTHOR

Lekraj Beedassy, Apr 10 2003

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified May 20 09:42 EDT 2013. Contains 225458 sequences.