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For challenges which involve deciding whether or not the input meets certain criteria, and outputting some data, representing that decision.
0
votes
Am I a Fibonacci Number?
[Python 3], 48 bytes
m=0;k=1;exec("k,m=m,m+k\nif k==n:print(1)\n"*n)
If n is the input, we generate the first n Fibonacci numbers and check if our input is one of them.