A103861 Euler's totient of prime(n)! - prime(n)# + 1.

1, 1, 72, 4830, 39899952, 6226593544, 355687354472272, 121615851757531824, 25500701524255140352000, 8839501251731586459279018676600, 8202317101101304783411826869132800, 13538116146734258320615004890482768163319520, 33452526612258948175814325380737291579993833222336

Offset: 1

Author

Reinhard Zumkeller, Feb 20 2005

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..26
• Reinhard Zumkeller, p(n)! - p(n)# + 1.

Crossrefs

Cf. A000010, A103855, A103896.

Programs

Mathematica

EulerPhi[Table[Prime[n]! - Product[Prime[i], {i, 1, n}] + 1, {n, 1, 10}]] (* Amiram Eldar, Feb 21 2020 *)

Formula

a(n) = A000010(A103855(n)).