Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of a.

A096031

Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of a.

Terms

    a(0) =19a(1) =90a(2) =120a(3) =150a(4) =244a(5) =585a(6) =700a(7) =769a(8) =1414a(9) =1474a(10) =1909a(11) =2829a(12) =3030a(13) =4774a(14) =6154a(15) =6324a(16) =7804a(17) =8274a(18) =8455a(19) =10614a(20) =11544a(21) =11725a(22) =12195a(23) =13675a(24) =13845a(25) =15094a(26) =15225a(27) =16969a(28) =17170a(29) =18525

External references