OFFSET
0,2
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 0..10000
PROG
(PARI) a(n)=my(N=1); n+1+sum(i=1, n, logint(N*=5, 4)); \\ Charles R Greathouse IV, Jan 11 2018
(PARI) first(n)=my(s, N=1/5); vector(n+1, i, s+=logint(N*=5, 4)+1) \\ Charles R Greathouse IV, Jan 11 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Offset corrected by Charles R Greathouse IV, Jan 11 2018
STATUS
approved