This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A286300 #8 May 09 2017 22:40:57
%S A286300 1,5,6,2,5,4,24,9,3,10,11,11,19,12,34,4,42,9,13,32,11,15,18,18,5,16,
%T A286300 27,17,17,48,19,18,56,18,55,6,61,59,37,20,12,18,18,12,65,8,28,22,7,45,
%U A286300 34,15,55,65,75,16,24,72,23,40,13,16,19,8,16,26,24,41,13
%N A286300 Square root of smallest square formed from n by incorporating all the digits of n in a new decimal number.
%C A286300 Square root of less restrictive version of A091873: a(n) <= A091873(n).
%C A286300 First difference between a(n) and A091873(n) is for n=13. a(13) = sqrt(361) = 19, while A091873(13) = sqrt(1369) = 37.
%C A286300 If n is square then a(n) = sqrt(n).
%H A286300 Michael De Vlieger, <a href="/A286300/b286300.txt">Table of n, a(n) for n = 1..10000</a>
%e A286300 a(4) = 2 since 4 = 2^2.
%e A286300 Table of the first 20 terms of related sequences:
%e A286300 n A068165 A091873 a(n)^2 a(n)
%e A286300 1: 1 1 1 1
%e A286300 2: 25 5 25 5
%e A286300 3: 36 6 36 6
%e A286300 4: 4 2 4 2
%e A286300 5: 25 5 25 5
%e A286300 6: 16 4 16 4
%e A286300 7: 576 24 576 24
%e A286300 8: 81 9 81 9
%e A286300 9: 9 3 9 3
%e A286300 10: 100 10 100 10
%e A286300 11: 121 11 121 11
%e A286300 12: 121 11 121 11
%e A286300 13: 1369 37 361 19
%e A286300 14: 144 12 144 12
%e A286300 15: 1156 34 1156 34
%e A286300 16: 16 4 16 4
%e A286300 17: 1764 42 1764 42
%e A286300 18: 1089 33 81 9
%e A286300 19: 169 13 169 13
%e A286300 20: 2025 45 1024 32
%e A286300 ...
%t A286300 Table[If[IntegerQ@ Sqrt@ n, Sqrt@ n, k = Floor@ Sqrt@ n; Function[t, While[Function[w, Times @@ Boole@ Map[w[[#1]] >= #2 & @@ # &, #] < 1]@ DigitCount[k^2] &@ Apply[Join, Map[Lookup[t, #] /. d_ /; IntegerQ@ d :> If[d > 0, {d, #}, {10, #}] &, Keys@ t]], k++]]@ KeyDrop[PositionIndex@ DigitCount@ n, 0]; k], {n, 69}] (* _Michael De Vlieger_, May 05 2017, Version 10.1 *)
%Y A286300 Cf. A068165, A091873.
%K A286300 nonn,base,easy
%O A286300 1,2
%A A286300 _Michael De Vlieger_, May 05 2017