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%I #16 Jan 19 2024 15:49:17
%S 109,409,509,709,809,1009,1109,1409,1609,1709,2309,2609,2909,3109,
%T 3209,3709,4409,4909,5009,5209,5309,6709,7109,7309,8009,8209,8609,
%U 9109,9209,10009,10709,10909,11909,12109,12409,12809,13009,13109,13309,13709
%N Primes of the form 100*n+9.
%H Vincenzo Librandi, <a href="/A166560/b166560.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) = 9 + 10 * A104045(n). - _Alois P. Heinz_, Jan 19 2024
%t Select[Table[100 n + 9, {n, 0, 700}], PrimeQ] (* _Vincenzo Librandi_, Jul 25 2012 *)
%o (Magma) [a: n in [0..250] | IsPrime(a) where a is 100*n+9]; // _Vincenzo Librandi_, Jul 25 2012
%Y Cf. A104045.
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Oct 25 2009
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