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!)
 A160792 Vertex number of a rectangular spiral related to prime numbers. The distances between nearest edges of the spiral that are parallel to the initial edge are the prime numbers, while the distances between nearest edges perpendicular to the initial edge are all one. 5
 0, 1, 3, 5, 10, 13, 23, 27, 44, 49, 77, 83, 124, 131, 189, 197, 274, 283, 383, 393, 522, 533, 693, 705, 902, 915, 1153, 1167, 1448, 1463, 1791, 1807, 2188, 2205, 2645, 2663, 3164, 3183, 3751, 3771, 4410, 4431, 5143, 5165, 5956, 5979, 6853, 6877, 7840, 7865 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS First differences give A160793. - Omar E. Pol, Oct 31 2011 LINKS Nathaniel Johnston, Table of n, a(n) for n = 0..5000 FORMULA a(2n) = a(2n-1) + Sum_{j=1..n} prime(j); a(2n+1) = a(2n) + n + 1 for n >= 1. - Nathaniel Johnston, Jun 16 2011 MAPLE A160792 := proc(n) option remember: if(n<=1)then return n: fi: if(n mod 2 = 0)then return procname(n-1)+add(ithprime(j), j=1..n/2): fi: return procname(n-1)+ceil(n/2): end: seq(A160792(n), n=0..49); # Nathaniel Johnston, Jun 16 2011 CROSSREFS Cf. A000040, A160790, A160791, A160793. Sequence in context: A165718 A031878 A265282 * A308759 A137395 A001767 Adjacent sequences:  A160789 A160790 A160791 * A160793 A160794 A160795 KEYWORD easy,nonn AUTHOR Omar E. Pol, May 29 2009 EXTENSIONS Terms after a(10) and edited by Nathaniel Johnston, Jun 16 2011 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 May 30 04:54 EDT 2020. Contains 334711 sequences. (Running on oeis4.)