Using the property of polynomial that a-b | p(a)- p(b) we have between N and 21
N-21 | P(N) - p(21)
As P(N) = N+ 51
We get N-21 | N+ 51 - 17
or N-21 | N + 34| or | N - 21 |(N+ 34) - (N-21)
or N-21 | 55
This gives N-21 = 1 or 5 or 11 or 55 or -1 or -5 or - 11 or -55
So N = 26 or 32 or 36 or 76 or 20 or 16 or 10 or - 34 (1)
Now with 32 we get N- 32 | N + 51 - (-247) or N-32 | 330 (2)
Finally with 37 we get N -37 | N + 51 - 33 | or N- 37 | 55
from set of (1) we get 26 or 32 or 36
from above (3) values we get N = 26
so N = 26 is the answer
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