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 1-2 of 2 results.

A121410 Positions of A121409(n) in A119405.

Original entry on oeis.org

1, 2, 4, 5, 14, 21, 31, 54, 65, 69, 77, 171, 205, 674, 675, 705, 717, 740, 782, 919, 1069, 1204, 1273
Offset: 1

Views

Author

Zak Seidov, Jul 28 2006

Keywords

Crossrefs

Cf. A119405, A121409.

A121409 Prime numbers p such that p and prime(p) have no common decimal digit and prime(p) and prime(prime(p)) have no common decimal digit.

Original entry on oeis.org

2, 3, 17, 19, 89, 317, 563, 1091, 2099, 3181, 5023, 44221, 53899, 410747, 410801, 448373, 451181, 481133, 519151, 617657, 738523, 882979, 992087, 1611433, 2167421, 2688299, 2723627, 2811089, 3331033, 3411043, 3499411, 3983911, 3988889, 6233933
Offset: 1

Views

Author

Zak Seidov, Jul 28 2006

Keywords

Comments

Subsequence of A119405. Positions of a(n) in A119405: A121410.

Examples

			992087 is a term because p(992087)=15353531, p(15353531)=282479297, and 992087 and 15353531 have no common decimal digit, nor do 15353531 and 282479297.

Crossrefs

Cf. A119405, A121410.

Programs

  • Mathematica
    Select[Prime[Range[10^6]],ContainsNone[IntegerDigits[#],IntegerDigits[Prime[#]]]&&ContainsNone[IntegerDigits[Prime[#]],IntegerDigits[Prime[Prime[#]]]]&] (* James C. McMahon, Oct 18 2024 *)
Showing 1-2 of 2 results.

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

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