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A147858 Differences of two coprime 4th powers. 3
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 (list; graph; refs; listen; history; text; internal format)
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 * A005917 A218216 A027455

Adjacent sequences:  A147855 A147856 A147857 * A147859 A147860 A147861

KEYWORD

nonn

AUTHOR

Max Alekseyev, Nov 15 2008

STATUS

approved

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Last modified February 25 13:30 EST 2018. Contains 299654 sequences. (Running on oeis4.)