OFFSET
0,7
MATHEMATICA
Table[Count[IntegerDigits[Product[Floor[(5i-1)/4], {i, n}]], 0], {n, 0, 80}]
PROG
(Python)
from math import prod
def a(n): return str(prod((5*k-1)//4 for k in range(1, n+1))).count("0")
print([a(n) for n in range(81)]) # Michael S. Branicky, Sep 01 2022
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Stefano Spezia, Sep 01 2022
STATUS
approved