Palindromic Super-4 Numbers.

Terms

a(0) =83338a(1) =1142411a(2) =1571751a(3) =1587851a(4) =2013102a(5) =2081802a(6) =2541452a(7) =3278723a(8) =3394933a(9) =3433343a(10) =3863683a(11) =4684864a(12) =5067605a(13) =5516155a(14) =5985895a(15) =6148416a(16) =6467646a(17) =6771776a(18) =6912196a(19) =7043407a(20) =7136317a(21) =7304037a(22) =7417147a(23) =7605067a(24) =7987897