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 A145532 #14 Jan 03 2022 02:07:59 %S A145532 59,19,7,4 %N A145532 Number of numbers removed in each step of Eratosthenes's sieve for 5!. %C A145532 The number of steps in Eratosthenes's sieve for n! is A133228(n). %C A145532 The number of primes less than 5! is 120 - 59 - 19 - 7 - 4 - 1 = 30 = A003604(5). %e A145532 a(1)=59 because in first step we removed all numbers divisible by 2 (=60) with the exception of the first one, i.e., 2. %e A145532 a(2)=19 because the number of numbers divisible by 3 and not divisible by 2 is 20 and we remove all with the exception of the first one, i.e., 3. %Y A145532 Cf. A003604, A133228, A145532-A145540. %K A145532 fini,nonn,full %O A145532 1,1 %A A145532 _Artur Jasinski_, Oct 12 2008