Write 0, 1, 2, 3, 4, ... in a triangular spiral, then a(n) is the sequence found by reading the terms along the line from 0 in the direction 0, 7, ...
A062725
Write 0, 1, 2, 3, 4, ... in a triangular spiral, then a(n) is the sequence found by reading the terms along the line from 0 in the direction 0, 7, ...
Terms
- a(0) =0a(1) =7a(2) =23a(3) =48a(4) =82a(5) =125a(6) =177a(7) =238a(8) =308a(9) =387a(10) =475a(11) =572a(12) =678a(13) =793a(14) =917a(15) =1050a(16) =1192a(17) =1343a(18) =1503a(19) =1672a(20) =1850a(21) =2037a(22) =2233a(23) =2438a(24) =2652a(25) =2875a(26) =3107a(27) =3348a(28) =3598a(29) =3857
External references
- oeis: A062725