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 A257197 Numbers n such that the decimal expansions of both n and n^2 have 1 as smallest digit and 6 as largest digit. 16
 116, 146, 1116, 1146, 1156, 1246, 1465, 1556, 1616, 3516, 3621, 4611, 4621, 4631, 11116, 11146, 11156, 11465, 11556, 11642, 15216, 16231, 21556, 22631, 25146, 25162, 25621, 33516, 34156, 35116, 35146, 35162, 36211, 36215, 36512, 46111, 46112, 46211, 46331 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Felix Fröhlich, Table of n, a(n) for n = 1..10000 MATHEMATICA sd1Q[n_]:=Module[{idn=IntegerDigits[n]}, Min[idn]==1&&Max[idn]==6]; Select[ Range[50000], AllTrue[{#, #^2}, sd1Q]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 22 2020 *) PROG (PARI) is(n) = vecmin(digits(n))==1 && vecmin(digits(n^2))==1 && vecmax(digits(n))==6 && vecmax(digits(n^2))==6 CROSSREFS Cf. A256630, A256631, A256633, A256634, A256708, A256709, A256889, A257210, A257211. Sequence in context: A327110 A255925 A095623 * A105934 A217256 A179168 Adjacent sequences:  A257194 A257195 A257196 * A257198 A257199 A257200 KEYWORD base,nonn AUTHOR Felix Fröhlich, Apr 18 2015 STATUS approved

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Last modified June 21 04:10 EDT 2021. Contains 345354 sequences. (Running on oeis4.)