Respuesta :

sqdancefan
6 pairs with a < b. 12 otherwise.

(3, 97), (11, 89), (17, 83), (29, 71), (41, 59), (47, 53)
and
(53, 47), (59, 41), (71, 29), (83, 17), (89, 11), (97, 3)