1515\u0031\u0035 (C99)\U000031\U000035 (C99)\x31\x35 (encoding-dependent)\061\065 (encoding-dependent)\u{31}\u{35} (C++23)\x{31}\x{35} (C++23, encoding-dependent)\o{061}\o{065} (C++23, encoding-dependent)\U00000031\U00000035\u0031\u0035\x31\x35 (encoding-dependent)\061\065 (encoding-dependent)\u0031\u0035\u{31}\u{35}\u0031\u0035\x31\x35\31\35\000031\000035=31=35%31%35