OFFSET
1,1
LINKS
Sean A. Irvine, Table of n, a(n) for n = 1..250
EXAMPLE
a(1) = 2 is a prime hence a(2) = 12; a(3) = 34, 3*4 = 12 and 3<4.
MATHEMATICA
f[n_Integer] := (d = Divisors[n]; l = Length[d]; If[ EvenQ[l], ToExpression[ ToString[ d[[l/2]] ] <> ToString[ d[[l/2 + 1]] ]], ToExpression[ ToString[d[[l/2 + .5]] ] <> ToString[ d[[l/2 + .5]] ]]] ); NestList[f, 2, 25]
CROSSREFS
KEYWORD
nonn,easy,base
AUTHOR
Amarnath Murthy, Jun 16 2001
EXTENSIONS
More terms from Robert G. Wilson v, Aug 08 2001
STATUS
approved