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f(a){return!a|a%4?a%8!=7-7:f(a/4);}
Try it online!Try it online!
It should be ok for 0 too. Thank you to @ceilingcat for suggestion from || to |.
f(a){return!a|a%4?a%8!=7:f(a/4);}
Try it online!
f(a){return!a|a%4?a%8-7:f(a/4);}
f(a){return!a||a%4a|a%4?a%8!=7:f(a/4);}
f(a){return!a||a%4?a%8!=7:f(a/4);}
It should be ok for 0 too.
