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URL: https://oeis.org/A079392

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A079392
Numbers k such that A000594(k) > 0 (Ramanujan's tau function is positive).
2
1, 3, 5, 8, 11, 14, 15, 16, 18, 19, 23, 24, 26, 28, 29, 33, 34, 36, 40, 41, 42, 47, 48, 50, 52, 54, 55, 57, 61, 62, 63, 64, 68, 69, 70, 71, 73, 74, 78, 79, 80, 81, 84, 86, 87, 88, 90, 91, 95, 97, 98, 100, 101, 102, 106, 107, 108, 109, 115, 117, 118, 119, 120, 121
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Tau Function.
EXAMPLE
A000594(1) = 1, therefore a(1) = 1.
MATHEMATICA
Select[Range[121], RamanujanTau[#] > 0 &] (* Amiram Eldar, Jan 18 2025 *)
PROG
(PARI) T(n)=n*(n+1)/2
rtau3(n)=local(y, j); y=0; j=1; while (T(j-1)<n, j++); j--; for (i=1, j, y=y-(-1)^i*(2*i-1)*x^(T(i-1))); y=y^8; polcoeff(y, n-1)
for (n=1, 100, if (rtau3(n)>0, print1(n", ")))
(PARI) isok(k) = ramanujantau(k) > 0; \\ Amiram Eldar, Jan 18 2025
CROSSREFS
Sequence in context: A008576 A047622 A240603 * A185723 A022852 A180124
KEYWORD
nonn
AUTHOR
Jon Perry, Jan 06 2003
EXTENSIONS
More terms from Seiichi Manyama, Sep 10 2017
STATUS
approved