Triangular numbers that remain triangular numbers when their reverse is added.
A167220
Triangular numbers that remain triangular numbers when their reverse is added.
Terms
- a(0) =0a(1) =3a(2) =15a(3) =630a(4) =1830a(5) =2346a(6) =4371a(7) =5253a(8) =5460a(9) =19110a(10) =98346a(11) =478731a(12) =519690a(13) =1216020a(14) =10669890a(15) =266539416a(16) =311737965a(17) =377836305a(18) =4375193196a(19) =5476282185a(20) =57391534206
External references
- oeis: A167220