OFFSET
1,2
COMMENTS
Number of numbers <= n that are either prime, a divisor of n, or both.
MATHEMATICA
Table[DivisorSigma[0, n] + PrimePi[n] - PrimeNu[n], {n, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, Feb 12 2022
STATUS
approved