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 A254071 Numbers n such that the decimal expansions of both n and n^2 have 4 as the digit with the smallest value and 8 as the digit with the largest value. 5
 684, 6684, 8874, 66684, 68474, 74758, 76478, 86478, 666684, 668474, 675684, 744758, 766458, 6666684, 6668474, 6675684, 6748678, 6845784, 7586478, 8686574, 8875684, 66666684, 66756684, 74744758, 74758576, 75858874, 75867574, 76464878, 86878458, 87546878 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..1000 MATHEMATICA fQ[n_] := Block[{c = DigitCount@ n}, And[Plus @@ Take[c, {1, 3}] == 0, Plus @@ Take[c, {9, 10}] == 0, c[[4]] > 0, c[[8]] > 0]]; Select[Range@ 1000000, fQ@ # && fQ[#^2] &] (* Michael De Vlieger, May 05 2015 *) PROG (PARI) is(n) = vecmin(digits(n))==4 && vecmin(digits(n^2))==4 && vecmax(digits(n))==8 && vecmax(digits(n^2))==8 CROSSREFS Cf. A256630, A256631, A256633, A256634, A256708, A256709, A256889, A257197, A257210, A257211, A256601, A257310, A249915, A257123, A257368, A257485, A257486, A257498, A238553. Sequence in context: A245393 A252856 A184089 * A022050 A107514 A116219 Adjacent sequences:  A254068 A254069 A254070 * A254072 A254073 A254074 KEYWORD nonn,base AUTHOR Felix FrÃ¶hlich, May 03 2015 STATUS approved

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Last modified September 16 08:18 EDT 2021. Contains 347469 sequences. (Running on oeis4.)