cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A261881 Minimal nested palindromic primes with seed 0.

Original entry on oeis.org

0, 101, 31013, 3310133, 933101339, 1093310133901, 30109331013390103, 333010933101339010333, 33330109331013390103333, 993333010933101339010333399, 104993333010933101339010333399401, 7810499333301093310133901033339940187
Offset: 1

Views

Author

Clark Kimberling, Sep 23 2015

Keywords

Comments

Let s be a palindrome and put a(1) = s. Let a(2) be the least palindromic prime having s in the middle; for n > 2, let a(n) be the least palindromic prime having a(n-1) in the middle. Then (a(n)) is the sequence of minimal nested palindromic primes with seed s.
Guide to related sequences:
seed sequence

Examples

			As a triangle:
........0
.......101
......31013
.....3310133
....933101339
..1093310133901
30109331013390103
		

Crossrefs

Cf. A261818.

Programs

  • Mathematica
    s = {0}; Do[NestWhile[# + 1 &, 1, ! PrimeQ[tmp = FromDigits[Join[#, IntegerDigits[Last[s]], Reverse[#]] &[IntegerDigits[#]]]] &]; AppendTo[s, tmp], {15}]; s
    (* Peter J. C. Moses, Sep 01 2015 *)