Let N, a number greater than 5, be the smaller member of a twin prime pair (e.g. {11,13} {17,19} etc.)

It is easily shown that if m=6 then N mod(m) = 5 - though, of course, 5 is itself the smaller member of a twin prime pair.

More interestingly:

(a) for what other values of m is every possible value of N mod(m) also the smaller member of a twin prime pair?

(b) Explain the phenomenon.