A087312 a(1) = 1; for n > 1, a(n) is the smallest number == -1 (mod a(n-1)), greater than n, with the same prime signature as n.

1, 3, 5, 9, 17, 33, 131, 143055667

Offset

1,2

Comments

a(9) does not exist because -1 is not a square mod 143055667. - David Wasserman, May 02 2005

Links

Table of n, a(n) for n=1..8.

Example

a(6) = 33 has the prime signature of 6 and a(4) = 197 has the prime signature of 7 and 197 == -1 (mod 33).

Crossrefs

Cf. A087311.

Sequence in context: A083318 A127904 A048578 * A099170 A251705 A351938

Adjacent sequences: A087309 A087310 A087311 * A087313 A087314 A087315

Keyword

fini,full,nonn

Author

Amarnath Murthy, Sep 02 2003

Extensions

Corrected and extended by David Wasserman, May 02 2005

Status

approved