a) 19; 28; 37; 46; 55; 64; 73; 82; 91; 69; 78; 87; 96. (19+91=110; 28+82=110....)
b) 255; 310; 365; 455; 510; 565; 655; 710; 765; 855; 910; 965.
255=114+141 310=119+191 365=169+196 365=187+178
455=214+241 510=219+291 565=269+296
655=314+341 710=319+391 765=369+396
855=414+441 910=419+491 965=469+496