First pentagonal number, 2nd hexagonal number, 3rd heptagonal number, 4th octagonal number and then repeat the same pattern: 5th pentagonal, 6th hexagonal, 7th heptagonal, 8th octagonal, etc.
A122061
First pentagonal number, 2nd hexagonal number, 3rd heptagonal number, 4th octagonal number and then repeat the same pattern: 5th pentagonal, 6th hexagonal, 7th heptagonal, 8th octagonal, etc.
Terms
- a(0) =1a(1) =6a(2) =18a(3) =40a(4) =35a(5) =66a(6) =112a(7) =176a(8) =117a(9) =190a(10) =286a(11) =408a(12) =247a(13) =378a(14) =540a(15) =736a(16) =425a(17) =630a(18) =874a(19) =1160a(20) =651a(21) =946a(22) =1288a(23) =1680a(24) =925a(25) =1326a(26) =1782a(27) =2296a(28) =1247a(29) =1770
External references
- oeis: A122061