A138117 Triangle read by rows: row n lists the first 2n-1 prime numbers.

2, 2, 3, 5, 2, 3, 5, 7, 11, 2, 3, 5, 7, 11, 13, 17, 2, 3, 5, 7, 11, 13, 17, 19, 23, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47

Offset: 1

Author

Omar E. Pol, Mar 14 2008, corrected Mar 15 2008

Keywords

• easy
• nonn
• tabf

Examples

			Triangle begins:
....... 2
..... 2,3,5
... 2,3,5,7,11
. 2,3,5,7,11,13,17
		

Crossrefs

Cf. A000040, A037126, A138139, A138143.

Programs

Mathematica

nn=10;Flatten[Table[Take[Prime[Range[2nn+1]],2n+1],{n,0,nn}]] (* Harvey P. Dale, Aug 16 2011 *)