This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 23 20:14 EDT 2019. Contains 328373 sequences. (Running on oeis4.)