A299790 Positive integers that do not equal any number minus its number of factorizations.

3, 9, 15, 21, 26, 29, 34, 35, 38, 39, 43, 45, 50, 51, 54, 57, 62, 69, 74, 86, 87, 90, 98, 101, 103, 107, 110, 111, 114, 118, 123, 124, 134, 135, 137, 142, 146, 151, 152, 155, 158, 161, 163, 170, 173, 174, 179, 186, 188, 189, 191, 194, 197, 206, 214, 218, 220, 221, 227, 229, 230, 231, 237, 239, 242, 244, 246, 248

Offset: 1

Author

Aidan Clarke, Jan 21 2019

Keywords

• nonn

Crossrefs

Cf. A001055 (number of factorizations).

Programs

PARI

fcnt(n, m) = {local(s); s=0; if(n == 1, s=1, fordiv(n, d, if(d > 1 & d <= m, s=s+fcnt(n/d, d)))); s};
f(n) = n - fcnt(n, n);
is(n) = j=1;x=2^(floor(log(n)/log(2))+2);while(jJinyuan Wang, Feb 14 2019

Extensions

More terms from Jinyuan Wang, Feb 14 2019