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.

Showing 1-1 of 1 results.

A109209 Palindromic primes pp such that digit sum of pp as substring appears more than once in pp.

Original entry on oeis.org

1123211, 1412141, 3228223, 3773773, 7949497, 9495949, 100161001, 101060101, 101141101, 110232011, 111050111, 112030211, 112111211, 113111311, 121111121, 122363221, 122444221, 125252521, 131030131, 131111131, 138313831, 138383831
Offset: 1

Views

Author

Zak Seidov, Jun 22 2005

Keywords

Examples

			9495949 is OK because its digit sum 49 appears twice in 9495949.

Crossrefs

Cf. A052019 Sum of digits of prime p is substring of p, A109208 Palindromic primes pp such that digit sum of pp is its substring.

Programs

  • Mathematica
    bb={};Do[id=IntegerDigits[p=Prime[n]];If[StringCount[ToString[p], ToString[Plus@@id]]>1&&Reverse[id]==id, AppendTo[bb, p]], {n, 1000000}];A109209=bb
Showing 1-1 of 1 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.