This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A107246 Sum of squares of octanacci numbers (Fibonacci 8-step numbers). 2
 0, 0, 0, 0, 0, 0, 0, 1, 2, 6, 22, 86, 342, 1366, 5462, 21846, 86871, 345952, 1378208, 5490992, 21877296, 87163696, 347276080, 1383600944, 5512434480, 21962292529, 87500852554, 348615720590, 1388934122190, 5533708922574, 22047074027470 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,9 COMMENTS Primes in this sequence include: a(8) = 2, a(17) = 280927. Semiprimes in this sequence include: a(9) = 6 = 2 * 3, a(10) = 22 = 2 * 11, a(11) = 86 = 2 * 43, a(13) = 1366 = 2 * 683, a(14) = 5462 = 2 * 2731, a(24) = 5512110374 = 2 * 2756055187, a(25) = 21961968423 = 3 * 7320656141, a(36) = 88177707994468342 = 2 * 44088853997234171. LINKS Eric Weisstein's World of Mathematics, Fibonacci n-Step Number. FORMULA a(n) = F_8(0)^2 + F_8(1)^2 + ... F_8(n)^2, where F_8(n) = A079262(n). CROSSREFS Cf. A079262, A107239-A107245, A107247-A107248. Sequence in context: A107243 A107244 A107245 * A107247 A047849 A150256 Adjacent sequences:  A107243 A107244 A107245 * A107247 A107248 A107249 KEYWORD easy,nonn AUTHOR Jonathan Vos Post, May 27 2005 EXTENSIONS Corrected from a(16) on by R. J. Mathar, Aug 11 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .