A083976 Smallest palindromic prime containing exactly n 5's.

5, 15451, 15551, 1550551, 154555451, 155535551, 355555553, 35555155553, 75555555557, 1555550555551, 152555555555251, 10555555355555501, 15505555555550551, 35555555755555553, 1555555055505555551, 1555555551555555551, 115555555555555555511

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, A083976, A083977, A083978, A083979, A083980, A083981.

Programs

Mathematica

Table[d = 5; i = 1;
 While[ x = IntegerDigits[Prime[i]];
  x != Reverse[x] || Count[x, d] != n , i++];
FromDigits[x], {n, 1, 6}]  (* Robert Price, Mar 25 2019 *)

Extensions

More terms from Giovanni Resta, Feb 08 2006