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 A045887 Number of distinct even numbers visible as substrings of n. 1
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 1, 1, 1, 2, 1, 2, 1, 2, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 2, 3, 2, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,21 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..10000 EXAMPLE a(124)=5 because we can form the following even numbers: 2,4,12,14,24. a(24)=2 because we can form 2,4. PROG (Haskell) import Data.List (isInfixOf) a045887 n = length \$ filter (`isInfixOf` (show n)) \$ map show [0, 2..n-1] -- Reinhard Zumkeller, Jul 19 2011 CROSSREFS Sequence in context: A276172 A322028 A079806 * A056832 A105931 A279495 Adjacent sequences:  A045884 A045885 A045886 * A045888 A045889 A045890 KEYWORD base,easy,nonn AUTHOR EXTENSIONS More terms from Fabian Rothelius, Feb 08 2001 a(102) and a(103) corrected by Reinhard Zumkeller, Jul 19 2011 STATUS approved

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Last modified August 8 19:29 EDT 2020. Contains 336298 sequences. (Running on oeis4.)