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 A253443 Smallest missing number within the first n terms in A109890. 4
 4, 4, 5, 5, 5, 5, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 34, 37, 37, 37, 37, 37 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS A253584(n) occurs exactly A253444(n) times. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 4..10000 PROG (Haskell) import Data.List (insert) a253443 n = a253443_list !! (n-4) a253443_list = f (4, []) 6 where    f (m, ys) z = g \$ dropWhile (< m) \$ a027750_row' z where      g (d:ds) | elem d ys = g ds               | otherwise = m : f (ins [m, m+1 ..] (insert d ys)) (z + d)      ins (u:us) vs'@(v:vs) = if u < v then (u, vs') else ins us vs -- Reinhard Zumkeller, Jan 03 2015 CROSSREFS Cf. A095258, A095259, A253444 (run lengths), A253584 (range), A253415. Sequence in context: A195783 A167770 A080800 * A140341 A332609 A244234 Adjacent sequences:  A253440 A253441 A253442 * A253444 A253445 A253446 KEYWORD nonn AUTHOR Reinhard Zumkeller, Jan 01 2015 STATUS approved

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Last modified September 27 10:28 EDT 2021. Contains 347689 sequences. (Running on oeis4.)