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 A027419 #15 Oct 14 2023 00:03:51
%S A027419 4,7,15,26,54,73,115,143,200,297,340,461,559,619,731,904,1098,1178,
%T A027419 1393,1556,1652,1912,2103,2391,2785,3008,3150,3392,3535,3789,4647,
%U A027419 4941,5363,5555,6299,6495,6963,7481,7864,8403,8968,9196,10115,10364,10805,11068,12271
%N A027419 Number of distinct products i*j with 0 <= i, j <= n-th prime.
%p A027419 seq(A027384(ithprime(n)),n=1..40) ; # _R. J. Mathar_, Jun 09 2016
%o A027419 (Python)
%o A027419 from sympy import prime
%o A027419 def A027419(n): return len({i*j for i in range(1,prime(n)+1) for j in range(1,i+1)})+1 # _Chai Wah Wu_, Oct 13 2023
%Y A027419 Cf. A027384.
%K A027419 nonn,easy
%O A027419 1,1
%A A027419 _N. J. A. Sloane_
%E A027419 More terms from _Olivier Gérard_, Nov 15 1997