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A045863 Numbers whose square has initial digit '9'. 3
3, 30, 31, 95, 96, 97, 98, 99, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 949, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 960, 961, 962, 963, 964, 965, 966, 967, 968, 969, 970, 971, 972, 973, 974, 975, 976 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

id9[n_]:=Module[{min=Floor[Sqrt[9*10^n]], max=Floor[Sqrt[10*10^n]]}, Select[ Range[ min, max], First[IntegerDigits[#^2]]==9&]]; Flatten[ Table[ id9[n], {n, 0, 5}]] (* Harvey P. Dale, May 29 2013 *)

PROG

(PARI) list(lim)=my(v=List()); for(d=1, 2*#digits(lim\=1), for(n=sqrtint(9*10^(d-1)-1)+1, min(sqrtint(10^d-1), lim), listput(v, n))); Vec(v) \\ Charles R Greathouse IV, Nov 03 2021

CROSSREFS

Cf. A045793.

Sequence in context: A344430 A217395 A077679 * A121023 A124520 A350814

Adjacent sequences:  A045860 A045861 A045862 * A045864 A045865 A045866

KEYWORD

nonn,base,easy

AUTHOR

Jeff Burch

STATUS

approved

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Last modified May 23 03:15 EDT 2022. Contains 353959 sequences. (Running on oeis4.)