Sorry but I don't know how to deal big number.
Here's another CODY problem that deals with something similar:
The Goldbach Conjecture
Find the sum of the elements in the "second" diagonal
Is the paranthesis sequence balanced ?
Must be in the front row...
It's Happy! It's Fun! It's Happy Fun Hyperball!
Golomb's self-describing sequence (based on Euler 341)
Muphry's Law of MATLAB
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