OFFSET
1,1
COMMENTS
The number of appearances of m >= 1 in this sequence is A061357(m). Conjecture: Every integer >= 4 appears at least once in this sequence. - Ya-Ping Lu, Mar 05 2023
The number of composites between 3 and (r+2)-th prime missing from Row 1 through Row r in the triangle is A334810(r+2). - Ya-Ping Lu, Mar 24 2023
EXAMPLE
Triangle begins:
4;
5, 6;
7, 8, 9;
8, 9, 10, 12;
10, 11, 12, 14, 15;
...
PROG
(PARI) T(r, c) = (prime(r+2) + prime(c+1))/2; \\ Michel Marcus, Mar 07 2023
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Pierre CAMI, Sep 02 2008
EXTENSIONS
Name simplified by Ya-Ping Lu, Mar 05 2023
STATUS
approved