a(n) = least k such that 1+2+3+...+k (k-th triangular number) is a multiple of n!; a(n) = least k such that A232096(k) >= n.

A232097

a(n) = least k such that 1+2+3+...+k (k-th triangular number) is a multiple of n!; a(n) = least k such that A232096(k) >= n.

Terms

    a(0) =1a(1) =3a(2) =3a(3) =15a(4) =15a(5) =224a(6) =224a(7) =4095a(8) =76544a(9) =512000a(10) =9511424a(11) =20916224a(12) =410572799a(13) =672358400a(14) =2985984000

External references