|
%I #18 Dec 10 2021 14:06:10
%S 0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,
%T 0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U 0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0
%N Characteristic function of positive numbers that are primes ending in 3.
%H Antti Karttunen, <a href="/A185706/b185706.txt">Table of n, a(n) for n = 1..65539</a>
%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>
%t Array[Boole@ And[PrimeQ@ #, Mod[#, 10] == 3] &, 105] (* _Michael De Vlieger_, Dec 16 2017 *)
%t Table[If[PrimeQ[n]&&Mod[n,10]==3,1,0],{n,150}] (* _Harvey P. Dale_, Dec 10 2021 *)
%o (PARI) A185706(n) = ((3==(n%10))&isprime(n)); \\ _Antti Karttunen_, Dec 16 2017
%Y Characteristic function of A030431.
%Y Cf. A185709.
%K base,nonn
%O 1
%A _N. J. A. Sloane_, Feb 10 2011
|
