OFFSET
1,2
COMMENTS
See A037278(n) = concatenation of divisors of n and A176558(n) = reverse concatenation of divisors of n. See A176554, A175354. Sequence of corresponding values of concatenations of divisors of a(n): {1, 12, 15, 1236, 1248, 12510, 111, ...), sequence of corresponding values of reverse concatenations of divisors of a(n): {1, 21, 51, 6321, 8421, 10521, 111, ...).
EXAMPLE
For n = 6; a(6) = 10; divisors of 10: 1, 2, 5, 10; both concatenation of divisors 12510 and reverse concatenation of divisors 10521 are nonprime numbers.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Jaroslav Krizek, Apr 21 2010
EXTENSIONS
Extended and revised by Charles R Greathouse IV, Apr 24 2010
STATUS
approved