A083975 Smallest palindromic prime containing exactly n 4's.

11411, 14341, 1464641, 1447441, 1444441, 144404441, 14244444241, 34444344443, 74444444447, 1444447444441, 3444444444443, 144444454444441, 14144444444444141, 34444444044444443, 1414444444444444141, 1444444447444444441, 104444444444444444401

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, A083975, A083976, A083977, A083978, A083979, A083980, A083981.

Programs

Mathematica

Table[d = 4; 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 Ray G. Opao, Sep 20 2004

Corrected and extended by Giovanni Resta, Feb 08 2006