A083972 Smallest palindromic prime containing exactly n 1's.

313, 11, 18181, 11311, 1311131, 1114111, 110111011, 111181111, 11115151111, 1011117111101, 1110111110111, 1111118111111, 111111212111111, 111111151111111, 11121111111112111, 1011111110111111101, 1111111611161111111, 111110111171111011111, 1111111111111111111, 111111111161111111111, 11111111181118111111111, 1101111111119111111111011

Offset

1,1

Links

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

Mathematica

digOfInterest = 1;
primes = {};
While[Length[primes] < 6,
  n = Length[primes] + 1;
  i = 0;
  While[Length[primes] != n,
   i++;
   dig = IntegerDigits[Prime[i]];
   If[
    (dig == Reverse[dig]) &&
     (Count[dig, digOfInterest] == n),
    AppendTo[primes, FromDigits[dig]];
    ];
   ];
  ];
primes
(* Kevin Southwick, Jul 25 2015 *)

Crossrefs

Cf. A083973, A083974, A083975, A083976, A083977, A083978, A083979, A083980, A083981.

Sequence in context: A370309 A234624 A292197 * A045275 A238057 A097023

Adjacent sequences: A083969 A083970 A083971 * A083973 A083974 A083975

Keyword

base,nonn

Author

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

Extensions

More terms from David Wasserman, Dec 06 2004

Corrected and extended by Giovanni Resta, Feb 08 2006

2 more terms from Erich Friedman, Mar 23 2008

Status

approved