OFFSET
1,1
COMMENTS
Equivalently, this sequence is the union of numbers of the form 25^n*(5*n+2) and numbers of the form 25^n*(5*n+3).
FORMULA
a(n) = 2.4 n + O(log n). - Charles R Greathouse IV, Dec 19 2013
PROG
(PARI) is(n)=n/=25^valuation(n, 25); n%5==2||n%5==3 \\ Charles R Greathouse IV and V. Raman, Dec 19 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
V. Raman, Dec 18 2013
STATUS
approved