A092002 Numbers that can be expressed as the difference of the squares of primes in exactly six distinct ways.

840, 1320, 1680, 2520, 3192, 3432, 4920, 5208, 5280, 5712, 6552, 6888, 9360, 11928, 16008, 19152, 19992, 25200, 29568, 31080, 35880, 38280, 38640, 40920, 41832, 45240, 47880, 48360, 48720, 51240, 51480, 53040, 56280, 57288, 61320, 63240

Offset

1,1

Links

Table of n, a(n) for n=1..36.

Example

840 = 31^2-11^2 = 37^2-23^2 = 41^2-29^2 = 47^2-37^2 = 73^2-67^2 =
107^2-103^2

Mathematica

Take[Transpose[Select[Tally[Sort[Last[#]-First[#]&/@(Subsets[ Prime[ Range[ 2000]], {2}]^2)]], Last[#]==6&]][[1]], 40] (* Harvey P. Dale, Nov 17 2013 *)

Crossrefs

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

Sequence in context: A033269 A272595 A179670 * A169827 A158402 A361421

Adjacent sequences: A091999 A092000 A092001 * A092003 A092004 A092005

Keyword

nonn

Author

Ray Chandler, Feb 22 2004

Status

approved