OFFSET
1,2
COMMENTS
If instead we read all the antidiagonals downwards, we get A005408 as the first column.
PROG
(PARI) lista(nn) = { my(A=matrix(nn, nn)); S=Set(); for(s=2, nn+1, for(i=1, s-1, if(s%2, q=[i, s-i], q=[s-i, i]); p=[sum(j=1, q[2]-1, A[q[1], j]), sum(j=1, q[1]-1, A[j, q[2]])]; n=1; while(setsearch(S, n) || (p[1]&&!isprime(p[1]+n)) || (p[2]&&isprime(p[2]+n)), n++); A[q[1], q[2]]=n; S=setunion(S, Set([n])); if(q[2]==1, print1(n, ", ")); )) } /* This is a modification of the PARI program by Max Alekseyev in A082228. - Petros Hadjicostas, Feb 25 2021 */
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Amarnath Murthy, Apr 09 2003
EXTENSIONS
Edited and extended David Wasserman, Feb 27 2006
STATUS
approved