OFFSET
1,2
COMMENTS
This sequence is the lexicographically earliest one satisfying the given constraint. It is built using the smallest possible choice for the next term [of the first row A203072] not leading to a contradiction.
Is this a permutation of the nonprimes?
LINKS
EXAMPLE
row 1: 1 8 4 14 6 10 22 27 15 ... [A203072]
row 2: 9 12 18 20 16 32 49 42 ...
row 3: 21 30 38 36 48 81 91 ...
row 4: 51 68 74 84 129 172 ...
row 5: 119 142 158 213 301 ...
row 6: 261 300 371 514 ...
row 7: 561 671 885 ...
row 8: 1232 1556 ...
row 9: 2788 ...
PROG
(PARI) list_by_antidiagonals(a)={my(u=[]); for(i=1, #a, u=concat(u, a[i]); forstep(j=i-1, 1, -1, u=concat(u, a[j]+=a[j+1]))); u} /* requires the first line as input */
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Eric Angelini, Dec 28 2011
STATUS
approved