Prime Curios!: 627626947

627626947
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The largest nine-digit left-truncatable prime such that when two of its digits are interchanged, the resulting number is also a left-truncatable prime. Can you locate the two digits in question? [Opao]

Submitted: 2003-11-18 01:47:54; Last Modified: 2008-06-13 20:55:51.