Least number k such that binomial(2k,k) is divisible by all squares to n squared but not (n+1) squared, or 0 if impossible.

A118562

Least number k such that binomial(2k,k) is divisible by all squares to n squared but not (n+1) squared, or 0 if impossible.

Terms

    a(0) =1a(1) =3a(2) =5a(3) =15a(4) =0a(5) =23a(6) =89a(7) =95a(8) =0a(9) =123a(10) =0a(11) =215a(12) =0a(13) =0a(14) =1117a(15) =943a(16) =0a(17) =2003a(18) =0a(19) =0a(20) =0a(21) =3455a(22) =0a(23) =1439a(24) =0a(25) =7846a(26) =0a(27) =7916a(28) =0a(29) =14735

External references