%I #10 Apr 22 2022 15:18:14
%S 0,0,1,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,
%T 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,
%U 0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0
%N Characteristic function of lesser twin primes: a(n) = 1 if both n and n+2 are primes, otherwise 0.
%H Antti Karttunen, <a href="/A353463/b353463.txt">Table of n, a(n) for n = 1..100000</a>
%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>
%F a(n) = A010051(n) * A010051(n+2) = A353464(n+2).
%o (PARI) A353463(n) = (isprime(n) && isprime(n+2));
%Y Characteristic function of A001359.
%Y Cf. A010051, A353464.
%Y Cf. also A156659, A156660.
%K nonn
%O 1
%A _Antti Karttunen_, Apr 22 2022