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A256405 a(n) = smallest missing number after seeing A166133(n). 4
2, 3, 3, 5, 5, 5, 5, 9, 9, 9, 9, 13, 13, 13, 13, 17, 17, 17, 17, 17, 22, 22, 22, 25, 25, 25, 25, 25, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The distinct terms are listed in A256408. See also A256409.

See the "blog" file in A166133 for discussion.

LINKS

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

John Mason, Table of n, a(n) for n = 1..722392 [10 megabytes]

John Mason, Table of n, a(n) for n = 1..2000000 [31 megabytes]

John Mason, Ten million terms (zipped file)

PROG

(Haskell)

import Data.List (delete); import Data.List.Ordered (isect)

a256405 n = a256405_list !! (n-1)

a256405_list = 2 : 3 : f (3:[5..]) 4 where

   f zs@(z:_) x = z : f (delete y zs) y where

                  y = head $ isect (a027750_row' (x ^ 2 - 1)) zs

-- Reinhard Zumkeller, Apr 01 2015

CROSSREFS

Cf. A166133, A027750, A005563, A256408, A256409.

Sequence in context: A225577 A265531 A083662 * A130149 A053046 A261179

Adjacent sequences:  A256402 A256403 A256404 * A256406 A256407 A256408

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 01 2015

STATUS

approved

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Last modified November 14 10:04 EST 2019. Contains 329111 sequences. (Running on oeis4.)