n-phi-torial, or phi-torial of n: Product k, 1 <= k <= n, k relatively prime to n.

A001783

n-phi-torial, or phi-torial of n: Product k, 1 <= k <= n, k relatively prime to n.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =24a(5) =5a(6) =720a(7) =105a(8) =2240a(9) =189a(10) =3628800a(11) =385a(12) =479001600a(13) =19305a(14) =896896a(15) =2027025a(17) =85085a(19) =8729721a(20) =47297536000a(21) =1249937325a(23) =37182145a(25) =608142583125

External references