OFFSET
1,1
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..10000
MATHEMATICA
d[n_] := Module[{}, su = 0; a = {}; For[i = 1, i <= n, i++, su = su + 1/ i^9; If[PrimeQ[i + 1], If[IntegerQ[(Denominator[su])^(1/9)], AppendTo[a, i + 1]]]]; a] d[2000]
Select[Flatten[Position[Denominator[Accumulate[1/Range[4000]^9]], _?(IntegerQ[ Surd[ #, 9]]&)]]+1, PrimeQ] (* Harvey P. Dale, Aug 06 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Jan 04 2007
STATUS
approved