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A297001 Numbers n such that A296992(n) = 2. 1
3, 9, 12, 18, 21, 27, 36, 40, 42, 48, 54, 72, 81, 84, 108, 120, 135, 144, 162, 168, 189, 192, 216, 243, 270, 280, 324, 336, 360, 378, 432, 448, 486, 540, 576, 640, 648, 672, 729, 756, 768, 828, 840, 864, 945, 972, 1080, 1152, 1296, 1344, 1458, 1512, 1701, 1728, 1890 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

Eric Weisstein's World of Mathematics, Tau Function.

MATHEMATICA

1 + Position[Table[-1 + SelectFirst[Range[0, 5], !Divisible[RamanujanTau@ n, n^#] &], {n, 2, 2000}], 2][[All, 1]] (* Michael De Vlieger, Dec 23 2017 *)

CROSSREFS

Cf. A000594, A296991, A296992.

Sequence in context: A310321 A310322 A261953 * A309394 A285564 A140979

Adjacent sequences:  A296998 A296999 A297000 * A297002 A297003 A297004

KEYWORD

nonn

AUTHOR

Seiichi Manyama and Robert G. Wilson v, Dec 23 2017

STATUS

approved

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Last modified May 16 01:55 EDT 2021. Contains 343937 sequences. (Running on oeis4.)