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A092000 Numbers that can be expressed as the difference of the squares of primes in exactly four distinct ways. 21
240, 792, 912, 1248, 2040, 2280, 2760, 3528, 3720, 3960, 4080, 4440, 4680, 4872, 5160, 5520, 5880, 6600, 6720, 6960, 7080, 8520, 8568, 8760, 9072, 9120, 9672, 9912, 10248, 10440, 11088, 11592, 11832, 11880, 12408, 12480, 12720, 13200, 13560 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

EXAMPLE

240 = 17^2-7^2 = 19^2-11^2 = 23^2-17^2 = 61^2-59^2

CROSSREFS

Cf. A090781, A090782, A090788, A092001-A092020.

Sequence in context: A268772 A202196 A060663 * A124352 A158562 A234728

Adjacent sequences:  A091997 A091998 A091999 * A092001 A092002 A092003

KEYWORD

nonn

AUTHOR

Ray Chandler, Feb 22 2004

STATUS

approved

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Last modified June 21 16:32 EDT 2021. Contains 345365 sequences. (Running on oeis4.)