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A066825 a(1) = 1; set of digits of a(n)^2 is a subset of the set of digits of a(n+1)^2. 7
1, 4, 13, 14, 31, 36, 54, 96, 113, 311, 487, 854, 1036, 1277, 1646, 3214, 3267, 3723, 4047, 4554, 4896, 5376, 10136, 13147, 13268, 16549, 20513, 21877, 25279, 26152, 27209, 28582, 31723, 32043, 32286, 33144, 35172, 35337, 35757, 35853 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Probably infinite and dense over Z+.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

PROG

(Haskell)

import Data.List ((\\))

a066825 n = a066825_list !! (n-1)

a066825_list = 1 : f 1 (drop 2 a000290_list) where

   f x (q:qs) | all (`elem` show q) xs = y : f y qs

              | otherwise              = f x qs

              where y = a000196 q; xs = show (x * x)

-- Reinhard Zumkeller, Nov 22 2012

CROSSREFS

Cf. A014563, A067633, A067634, A067635.

Cf. A000290, A000196.

Sequence in context: A135465 A135783 A135406 * A014563 A066774 A075339

Adjacent sequences:  A066822 A066823 A066824 * A066826 A066827 A066828

KEYWORD

nonn,base

AUTHOR

David W. Wilson, Feb 05 2002

STATUS

approved

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Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)