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 A061427 Geometric mean of the digits = 3. In other words, the product of the digits is = 3^k where k is the number of digits. 7
 3, 19, 33, 91, 139, 193, 319, 333, 391, 913, 931, 1199, 1339, 1393, 1919, 1933, 1991, 3139, 3193, 3319, 3333, 3391, 3913, 3931, 9119, 9133, 9191, 9313, 9331, 9911, 11399, 11939, 11993, 13199, 13339, 13393, 13919, 13933, 13991, 19139, 19193 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 EXAMPLE 319 is a term as the geometric mean of digits is (3*1*9) = 27 = 3^3. MATHEMATICA Select[Range[20000], GeometricMean[IntegerDigits[#]]==3&] (* Harvey P. Dale, Dec 11 2011 *) PROG (Haskell) a061427 n = a061427_list !! (n-1) a061427_list = g [1] where g ds = if product ds == 3 ^ length ds then foldr (\d v -> 10 * v + d) 0 ds : g (s ds) else g (s ds) s [] = [1]; s (9:ds) = 1 : s ds; s (d:ds) = 3*d : ds -- Reinhard Zumkeller, Jan 13 2014 CROSSREFS Cf. A061426-A061430. Cf. A174813. Sequence in context: A128069 A056246 A360081 * A069516 A098856 A178201 Adjacent sequences: A061424 A061425 A061426 * A061428 A061429 A061430 KEYWORD nonn,base,easy AUTHOR Amarnath Murthy, May 03 2001 EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org), May 16 2001 STATUS approved

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Last modified December 8 10:53 EST 2023. Contains 367678 sequences. (Running on oeis4.)