This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A351416 #3 Feb 10 2022 20:19:17
%S A351416 0,0,0,1,0,1,0,2,1,1,0,2,0,1,1,3,0,2,0,2,1,1,0,3,1,1,2,2,0,3,0,4,1,1,
%T A351416 1,3,0,1,1,3,0,3,0,2,2,1,0,4,1,2,1,2,0,3,1,3,1,1,0,5,0,1,2,5,1,3,0,2,
%U A351416 1,3,0,4,0,1,2,2,1,3,0,4,3,1,0,5,1,1,1,3,0,5,1,2,1,1,1
%N A351416 Number of divisors of n that are either squarefree semiprimes, numbers of the form p^k (p prime, k>1), or numbers with at least one square divisor > 1 and 3 or more distinct prime factors.
%F A351416 a(n) = Sum_{d|n} [[omega(d) = 2] = mu(d)^2], where [ ] is the Iverson bracket.
%e A351416 a(60) = 5; 60 has divisors 6,10,15 (squarefree semiprimes), 4 (=2^2), and 60 = 2^2*3*5 (has at least 3 distinct prime factors and at least 1 square divisor > 1).
%Y A351416 Cf. A001221 (omega), A008683 (mu), A351414.
%K A351416 nonn
%O A351416 1,8
%A A351416 _Wesley Ivan Hurt_, Feb 10 2022