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URL: https://oeis.org/A299158

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A299158
Numbers k such that k*(k+1) divides tau(k), where tau(k) = A000594(k) is Ramanujan's tau function.
2
2, 3, 5, 6, 7, 20, 27, 45, 91, 160, 240, 243, 343, 384, 792, 896, 2639, 1163799
OFFSET
1,1
COMMENTS
a(19) > 5*10^6.
Numbers k such that A299165(k) = 0.
Intersection of A063938 and A299157.
LINKS
Eric Weisstein's World of Mathematics, Tau Function.
MATHEMATICA
Select[Range[1000], Divisible[RamanujanTau[#], #*(#+1)] &] (* Amiram Eldar, Jan 10 2025 *)
PROG
(PARI) isok(k) = !(ramanujantau(k) % (k*(k+1))); \\ Amiram Eldar, Jan 10 2025
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Seiichi Manyama, Feb 04 2018
STATUS
approved