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comment On the cardinality of the set of right-truncatable primes
Wouldn't it be very easy to write a program that goes along a tree starting with $3$ or $7$, and at each stage adding $1$, $3$, $7$, $9$ on the right if that number continues to be prime? I know you asked for a non-computer proof, but why would one do that for what seems an obviously (fun) computational problem?
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revised Does $a_n=\prod^n_{k=1}(1-e^{k\alpha \pi i})$ converge to zero when $\alpha$ is irrational?
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