A062171 Number of non-unitary divisors of n (A048105) > number of distinct prime divisors of n (A001221).

8, 16, 24, 27, 32, 36, 40, 48, 54, 56, 60, 64, 72, 80, 81, 84, 88, 90, 96, 100, 104, 108, 112, 120, 125, 126, 128, 132, 135, 136, 140, 144, 150, 152, 156, 160, 162, 168, 176, 180, 184, 189, 192, 196, 198, 200, 204, 208, 216, 220, 224, 225, 228, 232, 234, 240

Offset: 1

Author

Jason Earls, Aug 28 2001

Keywords

• easy
• nonn

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A048105, A001221, A048108.

Programs

PARI

nud(n) = numdiv(n)-2^omega(n); j=[]; for(n=1,500, if(nud(n)>omega(n),j=concat(j,n))); j

PARI

is(n)=my(f=factor(n)[,2]); prod(i=1,#f,f[i]+1)>2^#f+#f \\ Charles R Greathouse IV, Sep 18 2015

Extensions

Offset corrected by Charles R Greathouse IV, Sep 18 2015