OFFSET
1,1
COMMENTS
a(18) > 2^63. [From Donovan Johnson, May 30 2010]
EXAMPLE
a(3) = 2*3*9 + 1 = 55. a(4) = 2*3*6*7 + 1 = 253.
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Apr 02 2003
EXTENSIONS
More terms from Diana L. Mecum, Jul 09 2007
a(13)-a(17) from Donovan Johnson, May 30 2010
STATUS
approved