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 A328497 Terms of A082180 that are not squares or cubes of primes. 3
 418, 27173, 2001341, 16024189487 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Complement of A168363 in A082180. Are there any other terms like 418 that are not in A228562? No other terms below 2*10^10. - Max Alekseyev, Dec 15 2023 LINKS Table of n, a(n) for n=1..4. MATHEMATICA Select[Range[30000], CompositeQ[#] && Not[IntegerQ[Sqrt[#]]] && Not[IntegerQ[#^(1/3)]] && Mod[Binomial[2*#, #], #] == 2 &] (* Vaclav Kotesovec, Oct 17 2019 *) PROG (PARI) forcomposite(c=1, , if(!setintersect(Set(isprimepower(c)), [2, 3]), if(Mod(binomial(2*c, c), c)==2, print1(c, ", ")))) CROSSREFS The odd terms form A228562. Cf. A082180, A168363. Sequence in context: A202527 A224557 A292422 * A138062 A350781 A097233 Adjacent sequences: A328494 A328495 A328496 * A328498 A328499 A328500 KEYWORD nonn,hard,more AUTHOR Felix Fröhlich, Oct 17 2019 EXTENSIONS a(4) from Max Alekseyev, Dec 15 2023 STATUS approved

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Last modified July 14 13:29 EDT 2024. Contains 374318 sequences. (Running on oeis4.)