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 A061677 When squared gives number composed just of the digits 1, 2, 3, 4. 1
 1, 2, 11, 12, 18, 21, 38, 111, 182, 338, 462, 482, 1111, 1188, 1488, 1521, 2079, 3338, 3368, 3482, 3512, 3639, 4818, 5868, 10688, 11011, 12018, 17639, 17979, 18012, 20521, 20771, 20838, 21079, 33338, 33368, 33632, 34962, 36361, 37739, 37962 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..10001 MAPLE filter:= t -> convert(convert(t^2, base, 10), set) subset {1, 2, 3, 4}: select(filter, [seq(seq(x, x=ceil(sqrt((10^i-1)/9)) .. floor(sqrt(4*(10^i-1)/9))), i=1..10)]); # Robert Israel, Mar 01 2016 MATHEMATICA Do[ If[ Union[ Join[ {1, 2, 3, 4}, IntegerDigits[n^2] ] ] == {1, 2, 3, 4}, Print[n] ], {n, 0, 200000} ] PROG (PARI) isok(n) = my(d = digits(n^2)); vecmin(d) && (vecmax(d) <= 4); \\ Michel Marcus, Feb 29 2016 CROSSREFS Sequence in context: A160948 A299973 A136971 * A110126 A125020 A065020 Adjacent sequences:  A061674 A061675 A061676 * A061678 A061679 A061680 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Jun 23 2001 STATUS approved

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Last modified October 21 16:25 EDT 2019. Contains 328302 sequences. (Running on oeis4.)