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Smallest prime beginning and ending in at least n 9's.
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%I #8 Jan 31 2024 01:05:31

%S 919,990599,99901999,9999049999,99999199999,99999901999999,

%T 9999999239999999,99999999299999999,9999999992999999999,

%U 9999999999049999999999,999999999990599999999999,99999999999904999999999999

%N Smallest prime beginning and ending in at least n 9's.

%e a(2) = 990599 is a prime that starts with 99 and ends in 99.

%Y Cf. A068160, A068161, A068162.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Feb 24 2002

%E More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 31 2003