Numbers n such that n*(n-1) is an oblong (promic, A002378) palindrome.

Terms

a(0) =1a(1) =2a(2) =3a(3) =17a(4) =78a(5) =539a(6) =1622a(7) =2458a(8) =5292a(9) =5314a(10) =52009a(11) =142402a(12) =143499a(13) =1610152a(14) =1713544a(15) =4670029a(16) =5218984a(17) =15137567a(18) =15282412a(19) =15814149a(20) =47370059a(21) =50702752a(22) =142594227a(23) =166691109a(24) =1694576062a(25) =2554554553a(26) =25541432473a(27) =47878213559a(28) =77714915543