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A147317 Numbers k which divide tau(k) and are not 7-smooth (where tau(k) = A000594(k) is Ramanujan's tau function). 1
88, 91, 92, 115, 161, 182, 207, 230, 264, 273, 276, 322, 345, 364, 414, 440, 455, 460, 483, 546, 549, 616, 644, 690, 728, 736, 792, 805, 819, 828, 910, 920, 928, 966, 1035, 1092, 1098, 1144, 1288, 1320, 1365, 1380, 1408, 1449, 1456, 1610, 1638, 1656, 1820 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..7427 (calculated from the b-file at A063938).

MATHEMATICA

aa = {}; Do[If[Mod[RamanujanTau[n], n] == 0 && EulerPhi[210 n] != 48 n, AppendTo[aa, n]], {n, 1, 2000}]; aa

CROSSREFS

Cf. A063938, A002473.

Sequence in context: A109989 A239154 A181469 * A143846 A255226 A241491

Adjacent sequences:  A147314 A147315 A147316 * A147318 A147319 A147320

KEYWORD

nonn

AUTHOR

Artur Jasinski, Nov 05 2008

STATUS

approved

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Last modified January 23 23:01 EST 2022. Contains 350515 sequences. (Running on oeis4.)