1,2

P. De Geest, Palindromic quasipronic numbers of the form n(n+2)

4224 belongs to this sequence as 4225 = 65^2.

(ARIBAS): stop := 400000; m := 1; while m < stop do s := m*m - 1; if s = int_reverse(s) then write(s, " "); end; inc(m); end;

Cf. A005563, A028503.

Sequence in context: A114737 A099296 A066619 this_sequence A123279 A134803 A030063

Adjacent sequences: A028501 A028502 A028503 this_sequence A028505 A028506 A028507

nonn,base

Patrick De Geest (pdg(AT)worldofnumbers.com)