Awesome but seem to fail on some numbers e.g. https://api.isfizzbuzz.xyz/api/150000000000000000000000000000000000000000000000000000000000 https://api.isfizzbuz

Awesome but seem to fail on some numbers e.g. https://api.isfizzbuzz.xyz/api/150000000000000000000000000000000000000000000000000000000000 https://api.isfizzbuzz.xyz/api/15000000000000000000000000000... BTW, there are neat divisibility rules which can give you the answer in practically linear time when the number is in decimal: https://en.wikipedia.org/wiki/Divisibility_rule https://en.wikipedia.org/wiki/Divisibility_rule