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 A316481 #19 Feb 25 2024 06:00:16 %S A316481 1,1100401,2220100,100040004,100100025,100220121,100400400,101002500, %T A316481 102030201,102212100,103002201,104040000,110250000,121022001, %U A316481 121220100,123210000,132020100,144000000,210221001,225000000,310112100,324000000,400040001,400400100 %N A316481 Squares whose arithmetic mean of digits is 1 (i.e., the sum of digits equals the number of digits). %C A316481 Each term's number of digits is in A056991 (Numbers with digital root 1, 4, 7, or 9). For every term k in A056991, this sequence contains at least one k-digit term, with the exception of k=4. (See A316480.) %H A316481 Giovanni Resta, <a href="/A316481/b316481.txt">Table of n, a(n) for n = 1..10000</a> (first 1543 terms from Jon E. Schoenfield) %e A316481 1049^2 = 1100401, a 7-digit number whose digit sum is 1+1+0+0+4+0+1 = 7, so 1100401 is a term. %Y A316481 Cf. A056991, A069711, A316480. %Y A316481 Intersection of A000290 and A061384. - _Michel Marcus_, Jul 06 2018 %K A316481 nonn,base %O A316481 1,2 %A A316481 _Jon E. Schoenfield_, Jul 04 2018