"Kaprekar quadruples": digits of X^4 taken D at a time sum to X (where D is number of digits in X.)

Terms

a(0) =1a(1) =7a(2) =45a(3) =55a(4) =67a(5) =100a(6) =433a(7) =4950a(8) =5050a(9) =38212a(10) =65068a(11) =190576a(12) =295075a(13) =299035a(14) =310024a(15) =336700a(16) =343333a(17) =394615a(18) =414558a(19) =433566a(20) =448228a(21) =450550a(22) =467236a(23) =475497a(24) =476191a(25) =486486a(26) =499500a(27) =500500a(28) =523513a(29) =534898