A147858 Differences of two coprime 4th powers.

0, 15, 65, 80, 175, 255, 369, 544, 609, 624, 671, 1105, 1295, 1695, 1776, 2145, 2320, 2385, 2400, 2465, 3439, 3471, 4015, 4095, 4160, 4641, 5936, 6095, 6305, 6545, 6560, 7599, 7825, 8080, 9855, 9919, 9999, 10545, 12209, 12240, 13345, 13920, 14016

Offset: 0

Author

Max Alekseyev, Nov 15 2008

Keywords

• nonn

Comments

Primitive elements of A147857: any element n of A147857 is of the form a(k)*m^4 for some positive integer m.

Crossrefs

Cf. A147854, A147856, A147857.

Programs

Mathematica

Join[{0},Rest[#[[2]]-#[[1]]&/@Select[Subsets[Range[0,20]^4,{2}], CoprimeQ@@#&] //Union]] (* Harvey P. Dale, Dec 08 2016 *)