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.

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A062654 Numbers k such that 88^k - 87^k is prime or a strong pseudoprime.

Original entry on oeis.org

5, 7, 19, 241, 607, 74047
Offset: 1

Views

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

Comments

All terms must be prime. - M. F. Hasler, Sep 21 2013
a(7) > 10^5. - Robert Price, May 28 2015

Crossrefs

Programs

Extensions

Edited by M. F. Hasler, Sep 21 2013
a(6) from Robert Price, May 28 2015 (computer run by Adam Marciniec)

A147671 Primes of the form 9^k-8^k.

Original entry on oeis.org

17, 2685817, 4555386192335572300559213161, 371616904162662789429456905017, 8591830681082909151487632391785043782074371844781522582861081817, 15210163976423790740121668878903464496715921225994590375394324312407011207180253342612172354203245908479382157462960757179523559095554271755561
Offset: 1

Views

Author

Keywords

Crossrefs

Programs

  • Mathematica
    lst={};Do[p=9^n-8^n;If[PrimeQ[p],AppendTo[lst,p]],{n,6!}];lst
    Select[Table[9^n-8^n,{n,150}],PrimeQ] (* Harvey P. Dale, May 13 2018 *)

A273010 Numbers n such that (9^n - 7^n)/2 is prime.

Original entry on oeis.org

3, 5, 7, 4703, 30113, 835391
Offset: 1

Views

Author

Tim Johannes Ohrtmann, May 13 2016

Keywords

Comments

All terms are prime.
The corresponding primes: 193, 21121, 1979713, ...

Crossrefs

Programs

  • Mathematica
    Select[Range[1, 10000], PrimeQ[(9^# - 7^#)/2] &]
  • PARI
    for(n=1,10000, if(isprime((9^n - 7^n)/2), print1(n,", ")))

Extensions

a(6) from Jon Grantham, Jul 29 2023
Previous Showing 11-13 of 13 results.