OFFSET
1,2
COMMENTS
There is a prime in each row.
REFERENCES
Paulo Ribenboim, "The Little Book Of Big Primes," Springer-Verlag, NY 1991, page 185.
EXAMPLE
Triangle begins
1;
2, 3;
3, 5, 7;
3, 7, 11, 13;
5, 7, 13, 19, 23;
MATHEMATICA
PrevPrim[n_] := Block[{k = n - 1}, While[ !PrimeQ[k], k-- ]; k]; Table[ PrevPrim[i*n + 1], {n, 2, 12}, {i, 1, n}]
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Robert G. Wilson v, Feb 27 2004
STATUS
approved