%I #8 Nov 15 2021 10:02:47
%S 0,1,1,0,1,1,1,1,0,1,1,0,1,1,1,0,1,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0,1,1,
%T 1,0,1,1,1,1,1,1,1,0,1,1,1,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,
%U 1,1,1,0,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,0,0,1,1,1,1,1,1,1,0,1,1
%N a(n) = 1 if A326042(k) < k, otherwise 0.
%H Antti Karttunen, <a href="/A348737/b348737.txt">Table of n, a(n) for n = 1..65537</a>
%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>
%H <a href="/index/Pri#prime_indices">Index entries for sequences computed from indices in prime factorization</a>
%H <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a>
%o (PARI)
%o A003961(n) = my(f = factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); \\ From A003961
%o A064989(n) = {my(f); f = factor(n); if((n>1 && f[1,1]==2), f[1,2] = 0); for (i=1, #f~, f[i,1] = precprime(f[i,1]-1)); factorback(f)};
%o A326042(n) = A064989(sigma(A003961(n)));
%o A348737(n) = (A326042(n)<n);
%Y Characteristic function of A348738.
%Y Cf. A000203, A003961, A064989, A326042.
%K nonn
%O 1
%A _Antti Karttunen_, Nov 02 2021