OFFSET
1,2
COMMENTS
a(13) > 893000. - Chai Wah Wu, Dec 17 2014
PROG
(Python)
def A215728(n):
l, x = [str(d)*n for d in range(10)], 1
for m in range(10**9):
s = str(x)
for k in l:
if k in s:
return m
x *= 5
return 'search limit reached'
# Chai Wah Wu, Dec 17 2014
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
V. Raman, Aug 22 2012
EXTENSIONS
a(13)-a(14) from Giovanni Resta, Apr 19 2016
a(15)-a(16) from Bert Dobbelaere, Feb 13 2019
STATUS
approved