Triangular numbers T(i) that can be expressed as the sum of 2 positive triangular numbers, T(j)+T(k), and for which i+j+k is a triangular number, where T is A000217.
A343426
Triangular numbers T(i) that can be expressed as the sum of 2 positive triangular numbers, T(j)+T(k), and for which i+j+k is a triangular number, where T is A000217.
Terms
- a(0) =276a(1) =741a(2) =17766a(3) =30876a(4) =42778a(5) =43071a(6) =44850a(7) =54946a(8) =73920a(9) =99681a(10) =163306a(11) =184528a(12) =254541a(13) =310866a(14) =446040a(15) =524800a(16) =963966a(17) =1006071a(18) =1046181a(19) =1160526a(20) =1258491a(21) =1873080a(22) =1929630a(23) =2793066a(24) =3034416a(25) =3108771a(26) =3121251a(27) =3454506a(28) =3635556a(29) =4305645
External references
- oeis: A343426