[gatehouse]

24x1 + 1 = 25, so we're off to a bad start.

[Someone]

But it gets better soon: 24x2 + 1 = 49 and that is prime, isn't it? :-)

[tlammens]

You forget the square root: 5 is prime.

[stbarnes]

huh? great-grandparent said nothing about square roots