So far , the following six taxicab numbers are known ( sequence A011541 in OEIS ) : Ta ( 2 ) , also known as the Hardy-Ramanujan number , was first published by Bernard Frénicle de Bessy in 1657 and later immortalized by an incident involving mathematicians G. H. Hardy and Srinivasa Ramanujan .
So far , the following six taxicab numbers are known ( sequence A011541 in OEIS ) :