This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A103861 #23 Apr 17 2025 08:08:48
%S A103861 1,1,72,4830,39899952,6226593544,355687354472272,121615851757531824,
%T A103861 25500701524255140352000,8839501251731586459279018676600,
%U A103861 8202317101101304783411826869132800,13538116146734258320615004890482768163319520,33452526612258948175814325380737291579993833222336
%N A103861 Euler's totient of prime(n)! - prime(n)# + 1.
%H A103861 Amiram Eldar, <a href="/A103861/b103861.txt">Table of n, a(n) for n = 1..26</a>
%H A103861 Reinhard Zumkeller, <a href="/A103855/a103855.txt">p(n)! - p(n)# + 1</a>.
%F A103861 a(n) = A000010(A103855(n)).
%t A103861 EulerPhi[Table[Prime[n]! - Product[Prime[i], {i, 1, n}] + 1, {n, 1, 10}]] (* _Amiram Eldar_, Feb 21 2020 *)
%Y A103861 Cf. A000010, A103855, A103896.
%K A103861 nonn
%O A103861 1,3
%A A103861 _Reinhard Zumkeller_, Feb 20 2005