OFFSET
1,1
COMMENTS
Product [{a(k)-1}/{a(k-1)}]= 2*3*4*5*... for k = 2,3,4,... {(5-1)/2}*{(61-1)/5}*{(1831-1)/61}*... = {2}*{3*4}*{5*6}*....
Some of the larger entries may only correspond to probable primes.
The Magma Calculator (http://magma.maths.usyd.edu.au/calc/) confirms that all terms given above through a(8) are, in fact, prime. - Jon E. Schoenfield, Aug 24 2009
EXAMPLE
a(2) = 2*2 + 1 = 5, a(3) = 5*(3*4) + 1 = 61, a(4) = 61*(5*6) + 1 = 1831.
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Apr 14 2004
EXTENSIONS
More terms from Joshua Zucker, Jul 24 2006
STATUS
approved