The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A049474 a(n) = ceiling(n/sqrt(2)). 7
 0, 1, 2, 3, 3, 4, 5, 5, 6, 7, 8, 8, 9, 10, 10, 11, 12, 13, 13, 14, 15, 15, 16, 17, 17, 18, 19, 20, 20, 21, 22, 22, 23, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 34, 35, 36, 37, 37, 38, 39, 39, 40, 41, 42, 42, 43, 44, 44, 45, 46, 46, 47 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..10000 MATHEMATICA Table[Ceiling[n/Sqrt[2]], {n, 0, 50}] (* G. C. Greubel, Jul 06 2017 *) PROG (Haskell) a049474 = ceiling . (/ sqrt 2) . fromIntegral -- Reinhard Zumkeller, Jul 01 2015 (PARI) a(n)=if(n, sqrtint((n^2-1)\2)+1, 0) \\ Charles R Greathouse IV, Sep 02 2015 CROSSREFS A099188(n) = 2*a(n). Cf. A049472. Sequence in context: A003003 A248186 A248183 * A076874 A127041 A173023 Adjacent sequences:  A049471 A049472 A049473 * A049475 A049476 A049477 KEYWORD nonn 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 April 15 03:00 EDT 2021. Contains 342974 sequences. (Running on oeis4.)