In math 'i^2 == -1'. But computers can only approximate that. Good values for 'i' are then:
int32_t 479772853 squared is -7
int32_t 1667710795 squared is -7
int16_t 16203 squared is -7
int16_t 16565 squared is -7
int8_t 53 squared is -7
int8_t 75 squared is -7
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