A085877 Smallest square k^2 == 1 (mod 10^n) where k > 1.

81, 2401, 62001, 1560001, 351600001, 47852000001, 610350000001, 586547900000001, 5508423000000001, 2032852170000000001, 184259414700000000001, 26756525040000000000001, 26756525040000000000001

Offset

1,1

Comments

Sequence is infinite as (10^n + 1)^2 is a candidate, i.e. a(n) < = (10^n +1)^2.

Links

Table of n, a(n) for n=1..13.

Formula

a(n) = A181539(n)^2.

Crossrefs

Cf. A085878.

Sequence in context: A038676 A016840 A128832 * A123219 A205512 A297606

Adjacent sequences: A085874 A085875 A085876 * A085878 A085879 A085880

Keyword

nonn

Author

Amarnath Murthy, Jul 07 2003

Extensions

Corrected and extended by Ray Chandler, Jul 09 2003

Status

approved