a(n) is the least integer k such that the sum of the digits of k^2 is 9*n.
A369953
a(n) is the least integer k such that the sum of the digits of k^2 is 9*n.
Terms
- a(0) =0a(1) =3a(2) =24a(3) =63a(4) =264a(5) =1374a(6) =3114a(7) =8937a(8) =60663a(9) =94863a(10) =545793a(11) =1989417a(12) =5477133a(13) =20736417a(14) =82395387a(15) =260191833a(16) =706399164a(17) =2428989417a(18) =9380293167a(19) =28105157886a(20) =99497231067a(21) =538479339417
External references
- oeis: A369953