OFFSET
1,1
EXAMPLE
1 is divisible by 1, but a(1) cannot be 1, because a(2) would have to be odd to make an even sum, but even to make an even product. Similarly, 2+4+3+7 and 2*4*3*7 are both divisible by 4, but if a(4) were 7 then a(5) would not exist, so a(4) = 11.
CROSSREFS
KEYWORD
nonn,easy,less
AUTHOR
Amarnath Murthy, Apr 18 2004
EXTENSIONS
Edited and extended by David Wasserman, Mar 21 2007
STATUS
approved