A090782 Numbers that can be expressed as the difference of the squares of primes in just three distinct ways.

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

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 * A337386 A023197 A204828

Adjacent sequences: A090779 A090780 A090781 * A090783 A090784 A090785

Keyword

nonn

Author

Ray Chandler, Feb 14 2004

Status

approved