A133115 Triangle read by rows: 2*A133113 - A000012 as infinite lower triangular matrices.
1, 3, 1, 7, 3, 1, 11, 7, 7, 1, 17, 11, 21, 7, 1, 23, 17, 47, 21, 11, 1, 31, 23, 91, 47, 43, 11, 1, 39, 31, 159, 91, 123, 43, 15, 1, 49, 39, 259, 159, 295, 123, 73, 15, 1, 59, 49, 399, 259, 627, 295, 255, 73, 19, 1, 71, 59, 589, 399, 1219, 627, 733, 255, 111, 19, 1, 83, 71, 839, 589, 2211, 1219, 1839, 733, 459, 111, 23, 1
Offset: 1
Examples
First few rows of the triangle: 1; 3, 1; 7, 3, 1; 11, 7, 7, 1; 17, 11, 21, 7, 1; 23, 17, 47, 21, 11, 1; 31, 23, 91, 47, 43, 11, 1; ...
Extensions
a(46) = 59 corrected and more terms from Georg Fischer, Jun 10 2023
Comments