Numbers k such that the k-th tetrahedral number is the sum of 2 tetrahedral numbers.

Terms

a(0) =4a(1) =15a(2) =55a(3) =58a(4) =74a(5) =109a(6) =110a(7) =119a(8) =140a(9) =175a(10) =245a(11) =294a(12) =418a(13) =435a(14) =452a(15) =474a(16) =492a(17) =528a(18) =535a(19) =550a(20) =562a(21) =588a(22) =644a(23) =688a(24) =702a(25) =714a(26) =740a(27) =747a(28) =753a(29) =818