A086556 a(1) = 1, then numbers coprime to all previous terms such that tau(a(n)) = n, where tau(k) = number of divisors of k.

1, 2, 9, 35, 14641, 2873, 47045881, 20677, 2301289, 160683647, 174887470365513049, 14226847, 16409682740640811134241, 11955403876831, 375917360641, 107972737, 397030588105939686862303733490241, 26979607331

Offset

1,2

Links

Table of n, a(n) for n=1..18.

Example

a(5) = 11^4, tau(14641) = 5 and a(6)= 2873 = 13^2*17 and tau(2873) = 6.

Crossrefs

Sequence in context: A306791 A175231 A175261 * A319012 A192694 A192702

Adjacent sequences: A086553 A086554 A086555 * A086557 A086558 A086559

Keyword

nonn

Author

Amarnath Murthy, Aug 29 2003

Extensions

More terms from David Wasserman, Mar 25 2005

Status

approved