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!)
 A145212 Numbers x such that there exists n in N : (x+1)^3 - x^3 = 67*n^2. 3
 146, 150922981, 155479346311338, 160173267776326886333, 165008898730338715685597026, 169990517382847468244368873843701, 175122531102470624411936031429357251258, 180409480316284222045549532749965177800150413 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Colin Barker, Table of n, a(n) for n = 1..150 Index entries for linear recurrences with constant coefficients, signature (1030191,-1030191,1). FORMULA a(n+2) = 1030190*a(n+1)-a(n)+515094. G.f.: x*(146+515095*x-147*x^2) / ((1-x)*(1-1030190*x+x^2)). - Colin Barker, Oct 18 2014, corrected Jul 13 2016 EXAMPLE The first relation is : 147^3-146^3=67*31^2. PROG (PARI) Vec(x*(146+515095*x-147*x^2)/((1-x)*(1-1030190*x+x^2)) + O(x^10)) \\ Colin Barker, Oct 18 2014, corrected Jul 13 2016 (PARI) isok(x) = issquare(((x+1)^3-x^3)/67) \\ Colin Barker, Jul 13 2016 CROSSREFS Sequence in context: A172877 A172911 A172933 * A195239 A122064 A320511 Adjacent sequences:  A145209 A145210 A145211 * A145213 A145214 A145215 KEYWORD nonn,easy AUTHOR Richard Choulet, Oct 04 2008 EXTENSIONS Editing and additional term a(8) from Colin Barker, Oct 18 2014 a(2) to a(8) corrected by Colin Barker, Jul 13 2016 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 February 24 00:38 EST 2020. Contains 332195 sequences. (Running on oeis4.)