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.
19 is present as A272565(19)=5 and 5 < A020639(19)=19. (19 is right after 5 on the third row of array A255127 while on A083221 it occurs at the beginning of row 8 that starts with 19 itself). 49 is present as it occurs as the fourth number on the third row of A255127 beginning with 5: 5, 19, 35, 49, ..., thus A272565(49)=5, while in A083221 49 occurs right after 7 on row 4, thus A020639(49)=7, and 5 < 7.
85 is the fourth number of the fourth row of A255127, which starts with 7: 7, 31, 59, 85, ..., thus A272565(85)=7, while on A083221 it occurs as the sixth term on the third row that starts with 5, thus A020639(85)=5, and 7 > 5, thus 85 is included in this sequence.