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A090782 Numbers that can be expressed as the difference of the squares of primes in just three distinct ways. 24
120, 168, 312, 408, 480, 552, 600, 672, 720, 1008, 1200, 1800, 2160, 2472, 2832, 2880, 3312, 3672, 4560, 5040, 5640, 6120, 6480, 6528, 7248, 7320, 7752, 7872, 8160, 8352, 8400, 8712, 8880, 9048, 9768, 9960, 10032, 10200, 10320, 10488, 10608, 10848 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

EXAMPLE

120 = 13^2-7^2 = 17^2-13^2 = 31^2-29^2.

CROSSREFS

Cf. A078667, A090788, A090781.

Sequence in context: A272594 A189975 A232461 * A023197 A204828 A204830

Adjacent sequences:  A090779 A090780 A090781 * A090783 A090784 A090785

KEYWORD

nonn

AUTHOR

Ray Chandler, Feb 14 2004

STATUS

approved

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Last modified March 25 01:30 EDT 2017. Contains 284036 sequences.