A387144 a(n) is the least k>1 such that omega(k^n-1) = omega(k^n+1) with omega = A001221.
3, 2, 2, 3, 3, 2, 3, 3, 2, 3, 2, 3483, 3, 2, 2, 2343, 8, 2, 3, 420, 2, 23, 2, 65, 3, 15, 2, 724, 2, 33, 15
Offset: 1
Programs
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PARI
a387144(n) = for(k=2, oo, if(omega(k^n-1)==omega(k^n+1), return(k)))
Comments