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!)
 A214848 First difference of A022846. 5
 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Number of triangular numbers in interval [n^2, (n+1)^2). For n > 0: a(n) = A006338(n). - Reinhard Zumkeller, Mar 03 2014 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..10000 EXAMPLE 28 is in [25, 36), a(5) = 1. 36 and 45 are in [36, 49), a(6) = 2. MATHEMATICA Differences[Round[Sqrt[2]Range[0, 100]]] (* Harvey P. Dale, Jun 14 2020 *) PROG (Haskell) a214848 n = a214848_list !! n a214848_list = zipWith (-) (tail a022846_list) a022846_list -- Reinhard Zumkeller, Mar 03 2014 CROSSREFS Cf. A022846. Sequence in context: A175922 A214856 A006337 * A006338 A020903 A133083 Adjacent sequences:  A214845 A214846 A214847 * A214849 A214850 A214851 KEYWORD nonn,easy AUTHOR Philippe Deléham, Mar 08 2013 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 June 15 18:11 EDT 2021. Contains 345049 sequences. (Running on oeis4.)