A147858 - OEIS

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

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OFFSET

0,2

COMMENTS

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

LINKS

Table of n, a(n) for n=0..42.

MATHEMATICA

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

CROSSREFS

Cf. A147854, A147856, A147857.

Sequence in context: A144710 A096905 A147857 * A364401 A005917 A218216

Adjacent sequences: A147855 A147856 A147857 * A147859 A147860 A147861

KEYWORD

nonn

AUTHOR

Max Alekseyev, Nov 15 2008

STATUS

approved