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 A364948 Perfect powers that are equal to the sum of the first k perfect powers > 1 for some k. 0
 4, 121, 2548735225 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..3. EXAMPLE 121 is a term because 121 = 11^2 = 4 + 8 + 9 + 16 + 25 + 27 + 32 = 2^2 + 2^3 + 3^2 + 2^4 + 5^2 + 3^3 + 2^5. MATHEMATICA Select[Accumulate[Select[Range[3723875], GCD @@ FactorInteger[#][[All, 2]] > 1 &]], GCD @@ FactorInteger[#][[All, 2]] > 1 &] CROSSREFS Cf. A001597, A013918, A013921, A013932. Sequence in context: A144508 A169972 A360664 * A080179 A268050 A268006 Adjacent sequences: A364945 A364946 A364947 * A364949 A364950 A364951 KEYWORD nonn,bref,hard,more AUTHOR Ilya Gutkovskiy, Aug 14 2023 STATUS approved

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Last modified November 29 22:05 EST 2023. Contains 367452 sequences. (Running on oeis4.)