A085069 a(1) =1, then the smallest number a(n)== 1 ( mod a(n-1)) such that tau(a(n))= n.

1, 2, 9, 10, 81, 244, 4826809, 24134046, 258867666103225, 517735332206451

Offset

1,2

Comments

a(11) = (2*a(10)-1)^10, which is about 1.4*10^150, too large to include. - David Wasserman, Jan 20 2005

Links

Table of n, a(n) for n=1..10.

Example

a(4) = 10, a(5) = 81 == 1 (mod 10) and tau(81) = 5.

Crossrefs

Cf. A085070.

Sequence in context: A363223 A338997 A363951 * A371163 A207670 A176545

Adjacent sequences: A085066 A085067 A085068 * A085070 A085071 A085072

Keyword

nonn

Author

Amarnath Murthy, Jun 30 2003

Extensions

More terms from David Wasserman, Jan 20 2005

Status

approved