

A092925


Smallest prime of the form n(n1)(n2)...(nk)1, or 0 if no such prime exists.


5



2, 3, 19, 5, 41, 7, 71, 89, 109, 11, 17159, 13, 2729, 239, 271, 17, 5813, 19, 419, 461, 72681839, 23, 599, 19275223967999, 701, 11793599, 811, 29, 929, 31, 415017197290314178559999, 968330879, 1659404761645592211554303999999
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OFFSET

3,1


COMMENTS

Conjecture: No term is zero.


LINKS



EXAMPLE

a(13) = 13*12*11*101 = 17159, as 131,13*121, 13*12*111, are all composite.


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS

a(900) has 1576 digits and is not included in the bfile because of its size.  Charles R Greathouse IV, Feb 15 2011


STATUS

approved



