N=144255+192255 then N is divisible by
7
35
49
28
N=144255−4255+192255+4255
=140(M)+196(B); M, N ϵ I+
If n ∈ N, then 72n + 23n−3.3n−1 is always divisible by
If n ∈ N, then 11n+2 + 122n+1 is divisible by
If 1 + ∑18r=0 (r(r + 2) + 1) r! = n!, then n is not divisible by