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 A289664 #19 Jul 06 2025 11:33:53 %S A289664 1,1,8,10,67,140,344,563,947,1197,2846,7357,7621,7629,48357,161507, %T A289664 697875,2760913,8354317,9754751,20284680,21082412,43030537,96835105, %U A289664 318536223,534252383,672026918,873944930,1996949860,2720035791,3321772681,3662980704,3923186891,7241151976 %N A289664 Number of integers in the interval [2,A289661(n)] whose greatest prime factor is equal to the n-th popular prime A385503(n). %C A289664 See A385503 for further links and information. %H A289664 Nathan McNew, <a href="https://www.researchgate.net/profile/Nathan-Mcnew/publication/275363769_Popular_values_of_the_largest_prime_divisor_function/">Popular values of the largest prime divisor function</a> (corrected version), page 16, November 2015. %Y A289664 Cf. A006530, A385503, A289661-A289665. %K A289664 nonn,more %O A289664 1,3 %A A289664 _N. J. A. Sloane_, Jul 25 2017 %E A289664 Edited, with terms updated from revised version of McNew, by _Peter Munn_, Jul 04 2025 %E A289664 Name corrected by _Pontus von Brömssen_, Jul 05 2025