Special Cuda thread mapping/indexing

I have different blocks of 34 threads each (0…33).

I need to find a formula so that in each of these blocks, the first 33 kernels (0…32) will point to the correspondent

bases[x]

With x from 0 to 32, while the last one, 33, to 66.

BlockSize = 34;

BaseIndex = BlockIndex * (BlockSize-1);