A083980 - OEIS

%I #12 Mar 25 2019 11:36:26

%S 191,919,19991,1993991,9199919,199909991,199999991,90999599909,

%T 95999999959,99999199999,9599999999959,199999959999991,

%U 959999999999959,39999999299999993,94999999999999949,99999999299999999,9299999999999999929,9999999992999999999

%N Smallest palindromic prime containing exactly n 9's.

%H Chai Wah Wu, <a href="/A083980/b083980.txt">Table of n, a(n) for n = 1..500</a>

%t Table[d = 9; i = 1;

%t  While[ x = IntegerDigits[Prime[i]];

%t   x != Reverse[x] || Count[x, d] != n , i++];

%t FromDigits[x], {n, 1, 5}]  (* _Robert Price_, Mar 25 2019 *)

%Y Cf. A083972, A083973, A083974, A083975, A083976, A083977, A083978, A083979, A083981.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 21 2003

%E Corrected and extended by _Giovanni Resta_, Feb 08 2006