Hello my question is how continues a dodecahedral number, continues in 13? or 33? and what number follows from the right number?
PD: (I don't talk english, so sorry if I have errors)
Hello my question is how continues a dodecahedral number, continues in 13? or 33? and what number follows from the right number?
PD: (I don't talk english, so sorry if I have errors)
The centered dodecahedral numbers are tabulated at oeis.org/A005904 and the formula $a(n) = (2n+1)(5n^2+5n+1)$ is given there. The first five terms are given as $1, 33, 155, 427, 909$.