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A077353 a(n) = (concatenation in ascending order of divisors of 5^n)/5^n. 1
1, 3, 61, 12201, 2440201, 4880402001, 97608040020001, 1952160800400020001, 390432160080004000200001, 780864320160008000400002000001, 1561728640320016000800004000002000001, 31234572806400320016000080000040000020000001 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..11.

FORMULA

a(0) = 1, a(n+1)) = 2*10^n*a(n) + 1.

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

CROSSREFS

Cf. A077351, A069872, A077352.

Sequence in context: A292110 A173366 A125661 * A220775 A089157 A068886

Adjacent sequences:  A077350 A077351 A077352 * A077354 A077355 A077356

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 05 2002

EXTENSIONS

More terms from Max Alekseyev, Dec 12 2011

STATUS

approved

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Last modified July 30 18:16 EDT 2021. Contains 346359 sequences. (Running on oeis4.)