login
a(n) = smallest n-digit prime formed by appending a digit to a(n-1); a(1) = 7.
0

%I #8 Jan 21 2019 19:01:55

%S 7,71,719,7193,71933,719333

%N a(n) = smallest n-digit prime formed by appending a digit to a(n-1); a(1) = 7.

%C There is no prime a(7) since 7193331,7193333,7193337,7193339 are not prime.

%C These are the first 6 entries of A048552. - R. J. Mathar, Oct 15 2011

%e a(1)=7

%e a(2)=71

%e a(3)=719

%e a(4)=7193

%e a(5)=71933

%e a(6)=719333

%K nonn,base,fini,full

%O 1,1

%A _Jorge Coveiro_, Jan 10 2005

%E Edited by _Charles R Greathouse IV_, Aug 02 2010