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 A147857 Differences of two positive 4th powers. 12
 0, 15, 65, 80, 175, 240, 255, 369, 544, 609, 624, 671, 1040, 1105, 1215, 1280, 1295, 1695, 1776, 2145, 2320, 2385, 2400, 2465, 2800, 3439, 3471, 3840, 4015, 4080, 4095, 4160, 4641, 5265, 5904, 5936, 6095, 6305, 6480, 6545, 6560, 7599, 7825, 8080, 8704 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS If n belongs to this sequence then so does n*m^4 for any positive integer m. Primitive elements (i.e., not of the form n*m^4 for m>1) are listed in A147858. There is no square in this sequence except 0. - Altug Alkan, Apr 08 2016 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE N:= 10^4: # to get all terms <= N Res:= {0}: for a from 1 to floor(sqrt(N-2)) do if a^4 > N then bmin:= ceil((a^4-N)^(1/4)) else bmin:= 1 fi; Res:= Res union {seq(a^4-b^4, b=bmin..a-1)} od: sort(convert(Res, list)); # Robert Israel, Sep 28 2018 MATHEMATICA nn = 50; Take[Union @@ Map[Differences, Union@ Map[Sort@ # &, Tuples[Range[Ceiling[nn/3]], {2}]]^4], nn] (* Michael De Vlieger, Apr 09 2016 *) CROSSREFS Cf. A147854, A147856, A147858 Sequence in context: A118531 A144710 A096905 * A147858 A005917 A218216 Adjacent sequences: A147854 A147855 A147856 * A147858 A147859 A147860 KEYWORD nonn AUTHOR Max Alekseyev, Nov 15 2008, Nov 19 2008 EXTENSIONS Offset changed by Robert Israel, Sep 28 2018 STATUS approved

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Last modified March 31 06:08 EDT 2023. Contains 361634 sequences. (Running on oeis4.)