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A002993 Initial digits of squares.
(Formerly M3348)
12
0, 1, 4, 9, 1, 2, 3, 4, 6, 8, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, 8, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n) = A000030(A000290(n)). - Reinhard Zumkeller, Aug 17 2008

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

T. D. Noe, Table of n, a(n) for n = 0..1000

Eric Weisstein's World of Mathematics, Gelfand's Question

MATHEMATICA

a[n_] := First[IntegerDigits[n^2]]; Table[a[n], {n, 0, 100} (* Vladimir Joseph Stephan Orlovsky, Dec 21 2008 *)

First[IntegerDigits[#]]&/@(Range[70]^2) (* Harvey P. Dale, Feb 09 2011 *)

PROG

(Haskell)

a002993 = a000030 . a000290  -- Reinhard Zumkeller, Apr 01 2015

CROSSREFS

Cf. A000030, A000290, A089951, A002994.

Sequence in context: A238261 A245238 A011238 * A276190 A011290 A196502

Adjacent sequences:  A002990 A002991 A002992 * A002994 A002995 A002996

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified February 20 22:25 EST 2018. Contains 299387 sequences. (Running on oeis4.)