A290449 Square roots of terms in A238237.

9, 45, 55, 99, 703, 999, 4950, 5050, 7272, 7777, 9999, 77778, 82656, 95121, 99999, 318682, 329967, 351352, 356643, 390313, 461539, 466830, 499500, 500500, 533170, 538461, 609687, 643357, 648648, 670033, 681318, 791505, 812890, 818181, 851851, 857143, 961038

Offset: 1

Author

N. J. A. Sloane, Aug 06 2017, following a suggestion from Max Alekseyev

Keywords

• nonn
• base

Comments

Yet another variant of the Kaprekar numbers A006886.

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..25000

Crossrefs

Cf. A238237, A006886.

Programs

Mathematica

Sqrt[Select[Range[600000]^2, EvenQ[len=IntegerLength[#]] && # == (Mod[#, 10^(len/2)] + Floor[#/10^(len/2)])^2 &]] (* Stefano Spezia, Jan 01 2025 *)