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 A065808 Square of n has a smaller square as its final digits. 2
 7, 8, 9, 10, 11, 12, 13, 15, 17, 18, 19, 20, 21, 22, 23, 25, 27, 28, 29, 30, 31, 32, 33, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 67, 68, 69, 70, 71, 72, 73, 75, 77, 78, 79, 80, 81, 82, 83, 85, 87, 88 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Includes all n >= 7 not == 4 or 6 (mod 10). - Robert Israel, Oct 24 2017 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE filter:= n ->   ormap(t -> issqr(n^2 mod 10^t), [\$1..ilog10(n^2)]): select(filter, [\$1..100]); # Robert Israel, Oct 24 2017 MATHEMATICA ds[n_] := NestWhileList[FromDigits[Rest[IntegerDigits[#]]] &, n, # > 9 &]; Select[Range[4, 88], Or @@ IntegerQ /@ Sqrt[Rest[ds[#^2]]] &] (* Jayanta Basu, Jul 10 2013 *) PROG (PARI): a065808(m) = local(k, a, b, d, j, n, r); for(k=1, m, a=length(Str(n))-1; b=1; j=1; n=k^2; while(b, d=divrem(n, 10^j); if(d[1]>0&&issquare(d[2]), b=0; issquare(n, &r); print1(r, ", "), if(j

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Last modified September 19 06:56 EDT 2021. Contains 347551 sequences. (Running on oeis4.)