OFFSET
1,12
COMMENTS
a(n) = 0 if n = 10m, 16m or 25m.
REFERENCES
Amarnath Murthy, "On the divisors of the Smarandache Unary sequence," Smarandache Notions Journal, Volume 11, 1-2-3, Spring 2000.
LINKS
Bo Gyu Jeong, Table of n, a(n) for n = 1..1000
Bo Gyu Jeong, C++ code which computes A083116 and this sequence
PROG
(Python)
from itertools import count
def A083117(n):
if not (n%10 and n%16 and n%25): return 0
for l in count(1):
k = (10**l-1)//9
for a in range(1, 10):
b, c = divmod(a*k, n)
if not c:
return b # Chai Wah Wu, Jan 23 2024
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 23 2003
EXTENSIONS
a(21) corrected by Bo Gyu Jeong, Jun 12 2012
More terms from Bo Gyu Jeong, Jun 13 2012
STATUS
approved