There are actually quite a few flights with 666 or 13 - thanks to OAG Max:
SV 0666 DAM-JED
JK 666 AGP-BCN-PMI
BU 666 AMS-SVG
JU 666 BEG-TGD
72N 666 BLZ-JNB
AI 666 BOM-GOI
LX 666 BSL-BIO
AT 666 CMN-FEZ
AY/KF 666 CPH-HEL
JD 666 CTS-OSA
SR 666 GVA-BCN
DC 666 HEL-SJY
CI 666 HKG-TPE
SU 666 IST-LED
JX 666 JCA-NCE
MS 666 JED-CAI
NX 666 MFM-KHH
AZ 666 MXP-CCS
B7 666 MZG-KHH
NH 666 NGS-TYO
EW 666 NUE-BER
OK 666 PRG-MAN
EB 666 ROC-ELM
WM 666 SBH-SXM
SK 666 STR-CPH
The number of flights with 13 or 013 was just too many to retype....