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 A256709 Numbers n such that the decimal expansions of both n and n^2 have 0 as smallest digit and 9 as largest digit. 23
 509, 890, 903, 905, 930, 950, 960, 970, 980, 990, 1039, 1091, 1095, 1097, 1390, 1709, 1903, 1905, 1930, 1970, 1980, 1990, 2049, 2093, 2095, 2097, 2190, 2509, 2809, 2903, 2905, 2907, 2930, 2970, 2990, 3009, 3049, 3079, 3090, 3092, 3095, 3097, 3098, 3099, 3209 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Felix Fröhlich, Table of n, a(n) for n = 1..10000 MATHEMATICA fQ[n_] := Block[{c = DigitCount@ n}, And[c[[9]] > 0, c[[10]] > 0]]; Select[Range@ 3209, fQ@ # && fQ[#^2] &] (* Michael De Vlieger, Apr 12 2015 *) PROG (PARI) is(n) = vecmin(digits(n))==0 && vecmin(digits(n^2))==0 && vecmax(digits(n))==9 && vecmax(digits(n^2))==9 CROSSREFS Cf. A136836, A256630, A256631, A256633, A256634, A256708. Sequence in context: A198195 A142819 A183058 * A110025 A059763 A031421 Adjacent sequences: A256706 A256707 A256708 * A256710 A256711 A256712 KEYWORD nonn,base AUTHOR Felix Fröhlich, Apr 08 2015 STATUS approved

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Last modified August 3 23:57 EDT 2024. Contains 374905 sequences. (Running on oeis4.)