OFFSET
2,3
COMMENTS
This is a very slowly growing sequence - by n=100000 the maximum value is 8.
If n is in A014574 then a(n) = 2. - Robert Israel, Aug 05 2014
LINKS
T. D. Noe, Table of n, a(n) for n = 2..10000
FORMULA
a(n) = A001221((n-1)*(n+1)).
EXAMPLE
a(11)=3 because (11-1)*(11+1)=10*12=2^3*3*5, which has 3 distinct prime factors, namely 2,3 and 5.
MAPLE
A082863 := proc(n)
A001221(n^2-1) ;
end proc: # R. J. Mathar, Aug 05 2014
# alternative:
A082863:= n -> nops(numtheory:-factorset(n^2-1)):
seq(A082863(n), n=1..100); # Robert Israel, Aug 05 2014
MATHEMATICA
Table[PrimeNu[n^2-1], {n, 2, 100}] (* Harvey P. Dale, Jul 05 2011 *)
PROG
(PARI) for (n=2, 100, print1(omega((n-1)*(n+1))", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon Perry, May 24 2003
STATUS
approved