OFFSET
0,3
MATHEMATICA
EulerPhi[Range[0, 25]!+1] (* Paolo Xausa, Oct 21 2023 *)
PROG
(PARI) {a(n) = eulerphi(n!+1)}
(Python)
from math import factorial
from sympy import totient
def A366760(n): return totient(factorial(n)+1) # Chai Wah Wu, Oct 20 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 20 2023
STATUS
approved