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 A003369 Numbers that are the sum of 2 positive 7th powers. 41
 2, 129, 256, 2188, 2315, 4374, 16385, 16512, 18571, 32768, 78126, 78253, 80312, 94509, 156250, 279937, 280064, 282123, 296320, 358061, 559872, 823544, 823671, 825730, 839927, 901668, 1103479, 1647086, 2097153, 2097280, 2099339, 2113536 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE From David A. Corneth, Aug 03 2020: (Start) 3909794986386 is in the sequence as 3909794986386 = 57^7 + 57^7. 6061605477062 is in the sequence as 6061605477062 = 19^7 + 67^7. 26019535290982 is in the sequence as 26019535290982 = 61^7 + 81^7. (End) MAPLE N:= 10^7: # to get all terms <= N S:= select(`<=`, {seq(seq(a^7+b^7, a=1..b), b=1..floor(N^(1/7)))}, N): sort(convert(S, list)); # Robert Israel, Sep 03 2017 MATHEMATICA lst={}; Do[If[(a^7+b^7)==n, AppendTo[lst, n]], {n, 200000}, {a, (n/2)^(1/7)}, {b, a, (n-a^7)^(1/7)}]; lst (* XU Pingya, Sep 03 2017 *) Module[{upto=10}, Select[Union[Total/@Tuples[Range[upto]^7, 2]], #<= (upto^7)&]] (* Harvey P. Dale, Feb 04 2019 *) CROSSREFS Cf. A000404 (2 squares), A003325 (2 cubes), A003336 (2 4th), A003347 (2 5th), A003358 (2 6th), A088719 (2 distinct 7th), A003380 (2 8th). Cf. A001015 (seventh powers). Sequence in context: A153425 A296060 A090121 * A303377 A258806 A216358 Adjacent sequences:  A003366 A003367 A003368 * A003370 A003371 A003372 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified November 26 23:41 EST 2020. Contains 338670 sequences. (Running on oeis4.)