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A068577
Numbers n such that tau(n)^2 > phi(n).
1
2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 26, 28, 30, 32, 36, 40, 42, 44, 45, 48, 50, 52, 54, 56, 60, 64, 66, 68, 70, 72, 78, 80, 84, 88, 90, 96, 100, 102, 104, 105, 108, 110, 112, 114, 120, 126, 130, 132, 138, 140, 144, 150, 154, 156, 160, 162, 168
OFFSET
1,1
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..396 (full sequence)
MATHEMATICA
Select[Range[170], DivisorSigma[0, #]^2 > EulerPhi[#] &] (* Ivan Neretin, Oct 16 2016 *)
CROSSREFS
Sequence in context: A094229 A067290 A106577 * A225731 A246352 A363227
KEYWORD
easy,nonn,fini,full
AUTHOR
Benoit Cloitre, Mar 26 2002
STATUS
approved