1Function: istotient 2Section: number_theoretical 3C-Name: istotient 4Prototype: lGD& 5Help: istotient(x,{&N}): true(1) if x = eulerphi(n) for some integer n, 6 false(0) if not. If N is given, set N = n as well. 7Doc: true (1) if $x = \phi(n)$ for some integer $n$, false (0) 8 if not. 9 \bprog 10 ? istotient(14) 11 %1 = 0 12 ? istotient(100) 13 %2 = 0 14 @eprog 15 If $N$ is given, set $N = n$ as well. 16 \bprog 17 ? istotient(4, &n) 18 %1 = 1 19 ? n 20 %2 = 10 21 @eprog 22