A098839 Smith square numbers.

4, 121, 576, 729, 6084, 10201, 17424, 18496, 36481, 51529, 100489, 124609, 184041, 195364, 410881, 559504, 674041, 695556, 732736, 887364, 896809, 966289, 988036, 1038361, 1190281, 1238769, 1726596, 1852321, 2166784, 2975625, 3407716, 3613801, 3663396

Offset

1,1

Links

Donovan Johnson, Table of n, a(n) for n = 1..10000

Example

a(2) = 121 because 121 is a Smith number as well as a square.

Mathematica

d[n_]:=IntegerDigits[n]; tr[n_]:=Transpose[FactorInteger[n]]; t={}; Do[If[!PrimeQ[n]&&Total[d[n]]==Total[d@tr[n][[1]]*tr[n][[2]], 2], AppendTo[t, n]], {n, Range[2, 1950]^2}]; t (* Jayanta Basu, Jun 04 2013 *)

Crossrefs

Cf. A006753.

Sequence in context: A075114 A017186 A355751 * A227525 A071129 A241366

Adjacent sequences: A098836 A098837 A098838 * A098840 A098841 A098842

Keyword

base,nonn

Author

Shyam Sunder Gupta, Oct 10 2004

Status

approved