Neurobics

Commonalities

Russell Dear

What have the following numbers in common? 346, 668, 770, 5324 and 13478? Well, among other things, they are all even numbers. Your mission, if you should accept it, is to discover what the following sets of numbers or letters have in common -- and we're looking for the simplest commonality. The answers may not come at once but they require no high-powered mathematics to find them and persistence should win out.

A, H, I, M, O, T, V, W.
277, 71, 101, 2, 809, 283, 499, 163.
4761, 2704, 6084, 15625, 784, 6889.
A, B, D, O, P, Q, R.
30, 70, 105, 110, 128, 154, 165, 1001.
A, F, H, N, Y, Z.
26384, 887, 4685, 11991101, 53555.
141, 592, 653, 598, 793, 238, 46.
X, I, C, M, L, V, D.
2835, 873, 494712, 8883, 45, 111222333.

Russell Dear is a Mathematician living in Invercargill