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A098839 Smith square numbers. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A053881 A075114 A017186 * A227525 A071129 A241366

Adjacent sequences:  A098836 A098837 A098838 * A098840 A098841 A098842

KEYWORD

base,nonn

AUTHOR

Shyam Sunder Gupta, Oct 10 2004

STATUS

approved

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Last modified February 22 14:58 EST 2017. Contains 282487 sequences.