OFFSET
2,1
EXAMPLE
a(6) =35 = 6*6 -1 = 3*13 and 6 = 2*3 are both of prime signature p*q, where p and q are primes.
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Jul 01 2003
EXTENSIONS
More terms from David Wasserman, Jan 12 2005
STATUS
approved