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%I #48 May 11 2024 20:22:28
%S 1,2,6,146,326,380,1116,1866,4808,5528,5730,21836,24804,38724
%N Numbers k such that (10^k + 23)/3 is prime.
%C Also numbers k for which A093137(k) + 7 or A002277(k) + 8 is prime.
%t Select[Range[1000], PrimeQ[(10^# + 23) / 3] &]
%o (Magma) [n: n in [0..400] | IsPrime((10^n+23) div 3)];
%o (PARI) is(n)=ispseudoprime((10^n+23)/3) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y Cf. numbers k such that (10^k+m)/3 is prime: A099411 (m=11), this sequence (m=23).
%Y Cf. A002277, A093137.
%K nonn,less,more
%O 1,2
%A _Vincenzo Librandi_, Sep 25 2016
%E a(9)-a(11) from _Michael S. Branicky_, Aug 16 2021
%E a(12)-a(13) from _Michael S. Branicky_, May 14 2023
%E a(14) from Kamada data by _Tyler Busby_, May 05 2024
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