A085065 a(1) = 4, a(n) = smallest number of the form k*a(n-1) +1 with the same prime signature p^2, where p is a prime.

4, 9, 289, 332929, 8867310888979, 78629202401805543263662441, 24730205881376410453776804740727484868533062121664161

Offset

1,1

Comments

a(8) = (28*A(7)+1)^2, which has 108 digits and is too large to include. - David Wasserman, Jan 11 2005

Links

Table of n, a(n) for n=1..7.

Crossrefs

A061092 gives the sequence with a(1) = 2 i.e. terms of the form k*a(n-1)+1 which are primes.( prime signature p^1)

Cf. A061092.

Sequence in context: A051671 A109103 A029734 * A068708 A370610 A367451

Adjacent sequences: A085062 A085063 A085064 * A085066 A085067 A085068

Keyword

nonn

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 29 2003

Extensions

More terms from David Wasserman, Jan 11 2005

Status

approved