OFFSET
1,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = length(union(A001222(binomial(n,k)))), for 0 <= k <= n.
EXAMPLE
For n=9, A001222({C(9,k)}) = {0,2,4,4,4,4,4,4,2,0} includes 3 distinct values, thus generating 3 classes of k values: {0,9},{1,8} and {2,3,4,5,6,7}. So a(9)=3.
MATHEMATICA
Table[Length[Union[Table[PrimeOmega[Binomial[n, k]], {k, 0, n}]]], {n,
1, 50}] (* G. C. Greubel, May 19 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved