Group the triangular numbers so that the n-th group sum is a multiple of n. 1, (3, 6, 10, 15), (21), (28), (36, 45, 55, 66, 78), (91, 105, 120, 136, 153, 171, 190), ... Sequence contains n-th group sum divided by n.
A114032
Group the triangular numbers so that the n-th group sum is a multiple of n. 1, (3, 6, 10, 15), (21), (28), (36, 45, 55, 66, 78), (91, 105, 120, 136, 153, 171, 190), ... Sequence contains n-th group sum divided by n.
Terms
- a(0) =1a(1) =17a(2) =7a(3) =7a(4) =56a(5) =161a(6) =30a(7) =95a(8) =1020a(9) =271a(10) =90a(11) =802a(12) =1452a(13) =790a(14) =161a(15) =7481a(16) =309a(17) =5882a(18) =8400a(19) =980a(20) =10260a(21) =6850a(22) =11152a(23) =6081a(24) =15903a(25) =3589a(26) =18221a(27) =2023a(28) =32166a(29) =32805
External references
- oeis: A114032