A083973 Smallest palindromic prime containing exactly n 2's.

2, 12421, 72227, 1221221, 3222223, 122232221, 322222223, 12222122221, 1202222222021, 1222227222221, 9222222222229, 122222232222221, 32222322222322223, 72222222422222227, 1202222222222222021, 1222222226222222221, 125222222222222222521, 722222222202222222227

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, A083974, A083975, A083976, A083977, A083978, A083979, A083980, A083981.

Programs

Mathematica

Table[d = 2; 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

Corrected and extended by Giovanni Resta, Feb 08 2006