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%I #31 Jan 19 2019 21:05:29
%S 11,21221,3333322121,0,5555555555544444443332311223,
%T 66666666666665555555555544444443333122321,0
%N a(n) is the greatest prime number with prime(1) digits 1, prime(2) digits 2, prime(3) digits 3, ..., prime(n) digits n with 1 <= n <= 9 or 0 if no such prime exists.
%C This sequence is finite and has 9 terms.
%C a(4)=0 and a(7)=0, since all the candidates are divisible by 3.
%C a(9)=99...988...877...766...655..544444443333322211 is the last term.
%H Giovanni Resta, <a href="/A264917/b264917.txt">Table of n, a(n) for n = 1..9</a>
%Y Cf. A272161.
%K nonn,base,fini,full
%O 1,1
%A _Pierre CAMI_, Apr 30 2016
%E a(5)-a(7) from _Giovanni Resta_, May 05 2016
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