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