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A092002 Numbers that can be expressed as the difference of the squares of primes in exactly six distinct ways. 0
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 (list; graph; refs; listen; history; text; internal format)
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 A045477

Adjacent sequences:  A091999 A092000 A092001 * A092003 A092004 A092005

KEYWORD

nonn

AUTHOR

Ray Chandler, Feb 22 2004

STATUS

approved

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Last modified July 21 17:20 EDT 2019. Contains 325198 sequences. (Running on oeis4.)