A299158 Numbers k such that k*(k+1) divides tau(k), where tau(k) = A000594(k) is Ramanujan's tau function.
2, 3, 5, 6, 7, 20, 27, 45, 91, 160, 240, 243, 343, 384, 792, 896, 2639, 1163799
Offset: 1
Links
- Eric Weisstein's World of Mathematics, Tau Function.
Programs
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Mathematica
Select[Range[1000], Divisible[RamanujanTau[#], #*(#+1)] &] (* Amiram Eldar, Jan 10 2025 *)
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PARI
isok(k) = !(ramanujantau(k) % (k*(k+1))); \\ Amiram Eldar, Jan 10 2025
Comments