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 A351519 #8 Dec 10 2024 09:02:29
%S A351519 1,2,3,4,4,5,5,7,6,6,6,9,7,8,8,10,8,11,9,12,10,10,10,15,11,11,12,13,
%T A351519 11,15,12,16,13,13,13,18,13,14,14,18,14,18,15,18,18,16,16,23,17,19,17,
%U A351519 19,17,22,18,22,18,18,18,26,19,20,22,24,20,23,20,23,21,24,21,30,22,23,25,25
%N A351519 a(n) = tau(n) + pi(n) - omega(n).
%C A351519 Number of numbers <= n that are either prime, a divisor of n, or both.
%H A351519 Robert Israel, <a href="/A351519/b351519.txt">Table of n, a(n) for n = 1..10000</a>
%F A351519 a(n) = A000005(n) + A000720(n) - A001221(n).
%p A351519 map(numtheory:-tau + numtheory:-pi - nops @ numtheory:-factorset, [$1..100]);
%p A351519 # _Robert Israel_, Dec 09 2024
%t A351519 Table[DivisorSigma[0, n] + PrimePi[n] - PrimeNu[n], {n, 100}]
%Y A351519 Cf. A000005 (tau), A000720 (pi), A001221 (omega).
%K A351519 nonn
%O A351519 1,2
%A A351519 _Wesley Ivan Hurt_, Feb 12 2022