A092016 Numbers that can be expressed as the difference of the squares of primes in exactly twenty distinct ways.

885360, 3527160, 3723720, 4444440, 7054320, 8921640, 9304680, 9524760, 9817080, 9849840, 9914520, 10038840, 11152680, 11171160, 12113640, 12543960, 13167000, 13728792, 14108640, 14774760, 15495480, 17264520, 17777760, 17882040

Offset

1,1

Links

Table of n, a(n) for n=1..24.

Example

885360 = 941^2-11^2 = 947^2-107^2 = 967^2-223^2 = 977^2-263^2 =
991^2-311^2 = 1123^2-613^2 = 1289^2-881^2 = 1979^2-1741^2 = 2213^2-2003^2 =
2473^2-2287^2 = 2719^2-2551^2 = 3323^2-3187^2 = 4391^2-4289^2 =
7933^2-7877^2 = 11087^2-11047^2 = 13037^2-13003^2 = 14771^2-14741^2 =
18457^2-18433^2 = 44273^2-44263^2 = 55339^2-55331^2

Crossrefs

Cf. A090781, A090782, A090788, A092000-A092020.

Sequence in context: A251409 A128286 A250571 * A269219 A224594 A105379

Adjacent sequences: A092013 A092014 A092015 * A092017 A092018 A092019

Keyword

nonn

Author

Ray Chandler, Feb 22 2004

Extensions

a(12)-a(24) from Donovan Johnson, Nov 26 2008

Status

approved