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 A039935 Smallest k for which k, 2k, ... nk all contain the digit 4. 9
 4, 24, 47, 471, 487, 1248, 1249, 6248, 6249, 6249, 12493, 12493, 12493, 12493, 12498, 31249, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 312497, 312497, 312497, 624984, 624984, 624984, 624984, 624984 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Giovanni Resta, Table of n, a(n) for n = 1..2047 EXAMPLE a(3) = 47 since 47, 94 and 141 all contain a 4. PROG (Python) def aupton(terms):   k, n, alst = 1, 1, []   while len(alst) < terms:     while not all(str(i*k).count('4') > 0 for i in range(1, n+1)): k += 1     while str(n*k).count('4') > 0: alst.append(k); n += 1     k += 1   return alst[:terms] print(aupton(39)) # Michael S. Branicky, Apr 24 2021 CROSSREFS Cf. A039932, A039933, A039934, A039936, A039937, A039938, A039939, A039940. Sequence in context: A224242 A066770 A080380 * A090821 A226575 A052645 Adjacent sequences:  A039932 A039933 A039934 * A039936 A039937 A039938 KEYWORD base,nonn AUTHOR EXTENSIONS More terms from Patrick De Geest, Oct 15 1999 STATUS approved

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Last modified May 25 11:50 EDT 2022. Contains 354071 sequences. (Running on oeis4.)