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

1,1

Comments

Yet another variant of the Kaprekar numbers A006886.

Links

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

Mathematica

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

Crossrefs

Cf. A238237, A006886.

Sequence in context: A044111 A006886 A053816 * A045913 A044492 A207359

Adjacent sequences: A290446 A290447 A290448 * A290450 A290451 A290452

Keyword

nonn,base,changed

Author

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

Status

approved