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A077353
a(n) = (concatenation in ascending order of divisors of 5^n)/5^n.
2
1, 3, 61, 12201, 2440201, 4880402001, 97608040020001, 1952160800400020001, 390432160080004000200001, 780864320160008000400002000001, 1561728640320016000800004000002000001, 31234572806400320016000080000040000020000001
OFFSET
0,2
FORMULA
a(0) = 1, a(n) = (10^A055642(5^n)/5)*a(n-1) + 1. - Jason Yuen, Aug 21 2024
EXAMPLE
a(5) = 15251256253125/3125 = 4880402001.
PROG
(PARI) a(n) = eval(concat(apply(x->Str(x), divisors(5^n))))/5^n \\ Max Alekseyev, Dec 12 2011
(PARI) a(n) = if(n==0, 1, (10^#Str(5^n)/5)*a(n-1)+1) \\ Jason Yuen, Aug 21 2024
CROSSREFS
KEYWORD
base,nonn,easy
AUTHOR
Amarnath Murthy, Nov 05 2002
EXTENSIONS
More terms from Max Alekseyev, Dec 12 2011
STATUS
approved