doesn't work if a and b are both even, but LCM handles it. if err == nil { if got := strings.TrimLeft(hex.EncodeToString(gcd.Bytes(p)), "0"); got != GCD { t.Fatalf("unexpected GCD: got %s, want %s", got, GCD) } } lcm, err := totient(p, q) if oddDivisorLargerThan(decodeHex(t, GCD)) { if err != errDivisorTooLarge { t.Fatalf("expected divisor too large error, got %v", err) } t.Skip("GCD too large") } if err != nil { t.Fatalf("failed to calculate totient: %v", err) } if got := strings.TrimLeft(hex.Enc...