A092015 Numbers that can be expressed as the difference of the squares of primes in exactly nineteen distinct ways.

120120, 513240, 722568, 2348808, 3721872, 4269720, 5442360, 5754840, 6109488, 7549080, 8288280, 9043320, 10986360, 12538680, 13037640, 13813800, 14395920, 15181320, 15408120, 15571920, 15735720, 16151520, 16379160, 16696680

Offset

1,1

Links

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

Example

120120 = 347^2-17^2 = 349^2-41^2 = 353^2-67^2 = 383^2-163^2 =
421^2-239^2 = 463^2-307^2 = 467^2-313^2 = 499^2-359^2 = 521^2-389^2 =
601^2-491^2 = 757^2-673^2 = 1031^2-971^2 = 1181^2-1129^2 = 1451^2-1409^2 =
2017^2-1987^2 = 2741^2-2719^2 = 4297^2-4283^2 = 5011^2-4999^2 =
15017^2-15013^2.

Crossrefs

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

Sequence in context: A043622 A272597 A190378 * A250673 A278005 A237336

Adjacent sequences: A092012 A092013 A092014 * A092016 A092017 A092018

Keyword

nonn

Author

Ray Chandler, Feb 22 2004

Extensions

a(13)-a(24) from Donovan Johnson, Nov 26 2008

Status

approved