n & pi(n)
G. L. Honaker, Jr. sent the following nice puzzle:
Find the smallest number n such that n and (n)
together contain each of the ten decimal digits exactly thrice.
= 9834, by G.L. Honaker, Jr. This is the only once-pandigital
= 455627894, by Chuck Gaydos. This is the smallest twice-pandigital.