a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A001405(k) = C(k, floor(k/2)) equals n.

A081394

a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A001405(k) = C(k, floor(k/2)) equals n.

Terms

    a(0) =1a(1) =6a(2) =10a(3) =27a(4) =96a(5) =147a(6) =363a(7) =627a(8) =959a(9) =1547a(10) =1919a(11) =2641a(12) =2645a(13) =3339a(14) =6241a(15) =6909a(16) =6913a(17) =6943a(18) =6923a(19) =6937a(20) =16405a(21) =19981a(22) =24325a(23) =31675a(24) =31679a(25) =35329a(26) =36959a(27) =36963a(28) =38915a(29) =38927

External references