A196023 Primes that are palindromes and have 666 in the middle.

16661, 76667, 3166613, 3466643, 7466647, 7666667, 145666541, 148666841, 152666251, 155666551, 169666961, 176666671, 181666181, 304666403, 305666503, 307666703, 308666803, 329666923, 347666743, 349666943, 373666373, 374666473, 383666383, 391666193, 397666793

Offset: 1

Author

Arkadiusz Wesolowski, Sep 26 2011

Keywords

• base
• nonn

References

• N. J. A. Sloane, personal communication, 2011.

Links

• Arkadiusz Wesolowski, Table of n, a(n) for n = 1..1000
• G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 3166613
• Wikipedia, Number of the Beast
• Index entries for sequences related to palindromes

Crossrefs

Subsequence of A131645.

Programs

Mathematica

Select[Table[FromDigits@Join[Flatten@IntegerDigits@PadLeft[{666}, 2, n], Reverse@IntegerDigits[n]], {n, 397}], PrimeQ] (* Arkadiusz Wesolowski, Dec 03 2011 *)