Smallest n-digit triangular number - smallest n-digit number.

Terms

a(0) =0a(1) =0a(2) =5a(3) =35a(4) =11a(5) =128a(6) =405a(7) =1628a(8) =5153a(9) =6281a(10) =20331a(11) =404505a(12) =1326005a(13) =2437316a(14) =12392316a(15) =42485480a(16) =37150046a(17) =18810a(18) =179470703a(19) =2237948990a(20) =10876002500a(21) =22548781025a(22) =26940078203a(23) =242416922750a(24) =572687476751