Re: [math-fun] prime ladders

On Fri, 13 Mar 2009, Andrew Trevorrow wrote:

Note that 929573 is missing from the above MathWorld page.

Perhaps since replacing the leading 9 by 0 gives a prime? PS Once again I missed an opportunity to find the weak prime concept. A simple search in the OEIS on the number 971767 brings up the sequence: http://www.research.att.com/~njas/sequences/A050249 --Edwin