a(n) is the smallest k such that in the prime power factorization of k! at least the first n positive exponents are even.

A240620

a(n) is the smallest k such that in the prime power factorization of k! at least the first n positive exponents are even.

Terms

    a(0) =6a(1) =6a(2) =10a(3) =20a(4) =48a(5) =54a(6) =338a(7) =816a(8) =816a(9) =816a(10) =816a(11) =816a(12) =37514a(13) =37514a(14) =37514a(15) =37514a(16) =268836a(17) =268836a(18) =591360a(19) =855368a(20) =1475128a(21) =1475128a(22) =1475128a(23) =1475128a(24) =1475128a(25) =1475128a(26) =127632241a(27) =472077979a(28) =472077979a(29) =472077979

External references