A083980 Smallest palindromic prime containing exactly n 9's.

191, 919, 19991, 1993991, 9199919, 199909991, 199999991, 90999599909, 95999999959, 99999199999, 9599999999959, 199999959999991, 959999999999959, 39999999299999993, 94999999999999949, 99999999299999999, 9299999999999999929, 9999999992999999999

Offset: 1

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 21 2003

Keywords

• base
• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..500

Crossrefs

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

Programs

Mathematica

Table[d = 9; i = 1;
 While[ x = IntegerDigits[Prime[i]];
  x != Reverse[x] || Count[x, d] != n , i++];
FromDigits[x], {n, 1, 5}]  (* Robert Price, Mar 25 2019 *)

Extensions

Corrected and extended by Giovanni Resta, Feb 08 2006