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.
%I A145106 #23 Feb 11 2021 10:38:06 %S A145106 1,2,4,7,10,14,18,32,55,102,177,190,247,276,372,1524,1545,2502,4966, %T A145106 5294,13030,13785,14329,27333,44224,93812,127176,128640,136434,184614, %U A145106 269407,311257,349903,389756 %N A145106 Numbers n such that 6^n+5 is prime. %C A145106 a(27) > 10^5. - _Robert Price_, Aug 06 2017 %C A145106 As reported by Lelio R Paula in November 2014 at primenumbers.net/prptop, the following three terms are also in this sequence: 127176, 128640, 136434. It is not confirmed that they are the next terms, however. - _Robert Price_, Aug 06 2017 %e A145106 6^1+5=11 and 6^2+5=41, which are both prime, so 1 and 2 are in the sequence. 6^3+5=221 is not prime since it is divisible by 7, so 3 is not in the sequence. %t A145106 Select[Range[0, 100000], PrimeQ[6^# + 5] &] (* _Robert Price_, Aug 06 2017 *) %o A145106 (PARI) is(n)=ispseudoprime(6^n+5) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A145106 Cf. A059614. %K A145106 nonn %O A145106 1,2 %A A145106 _Dmitry Kamenetsky_, Oct 02 2008 %E A145106 a(21)-a(26) from _Robert Price_, Aug 06 2017 %E A145106 a(27)-a(30) from _Paul Bourdelais_, Jan 28 2021 %E A145106 a(31)-a(34) from _Paul Bourdelais_, Feb 11 2021