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 A295009 Numbers kn such that the largest digit of k^2 is 9. 9

%I

%S 3,7,13,14,17,23,27,30,31,33,36,37,43,44,47,53,54,57,63,64,67,70,73,

%T 77,83,86,87,89,93,95,96,97,98,99,103,107,113,114,117,118,123,127,130,

%U 133,134,136,137,138,139,140,141,143,147,148,153,157,158,161,163,164,167,170,171

%N Numbers kn such that the largest digit of k^2 is 9.

%F a(n) = sqrt(A295019(n)), where sqrt = A000196 or A000194 or A003059.

%e 23 is in this sequence because 23^2 = 529 has 9 as largest digit.

%o (PARI) select( is_A295009(n)=n&&vecmax(digits(n^2))==9 , [0..999]) \\ The "n&&" avoids an error message for n=0.

%Y Cf. A295019 (the corresponding squares), A277959 .. A277961 (same for digit 2 .. 4), A295005 .. A295008 (same for digit 5 .. 8).

%Y Cf. A000290 (the squares).

%K nonn,base

%O 1,1

%A _M. F. Hasler_, Nov 12 2017

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Last modified February 18 00:28 EST 2020. Contains 332006 sequences. (Running on oeis4.)