OFFSET

1,4

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..1000

EXAMPLE

For n = 50, the number of distinct prime factors of C(50, k) can be 0,2,3,4,5,6,7,8,9,10. The maximum is reached at several positions k=15,17,...,33,35. Thus a(50) = 15, far from the central C(50, 25).

MATHEMATICA

Table[Min@ MaximalBy[Range[0, n], PrimeNu@ Binomial[n, #] &], {n, 78}] (* Michael De Vlieger, Aug 01 2017 *)

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved