OFFSET
1,1
EXAMPLE
a(3) = 7 has the prime signature of 3 and a(4) = 169 has the prime signature of 4 and 169 == 1 (mod 7).
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Sep 02 2003
EXTENSIONS
More terms from David Wasserman, May 02 2005
STATUS
approved