|
Search: id:A063478
|
|
|
| A063478 |
|
Sum_{d|F(n)} d^2, where F(n) are the Fibonacci numbers. |
|
+0
1
|
|
| 1, 1, 5, 10, 26, 85, 170, 500, 1450, 3172, 7922, 31031, 54290, 143140, 483860, 1105000, 2550410, 8923300, 17494900, 53353040, 150655700, 313727044, 821223650, 3291697500, 5862907302, 14736586180, 48413209000, 113026206800
(list; graph; listen)
|
|
|
OFFSET
|
1,3
|
|
|
LINKS
|
Harry J. Smith, Table of n, a(n) for n=1,...,200
|
|
PROGRAM
|
(PARI) j=[]; for(n=1, 40, j=concat(j, sumdiv(fibonacci(n), d, d^2))); j
(Other) sage: [sigma(fibonacci(n), 2)for n in xrange(1, 29)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2009]
(PARI) { allocatemem(20000000); h=1; g=f=0; for (n=1, 200, f+=h; h=g; g=f; write("b063478.txt", n, " ", sumdiv(f, d, d^2)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 23 2009]
|
|
CROSSREFS
|
Cf. A000045.
Sequence in context: A083010 A166388 A066872 this_sequence A025486 A128665 A054298
Adjacent sequences: A063475 A063476 A063477 this_sequence A063479 A063480 A063481
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Jason Earls (zevi_35711(AT)yahoo.com), Jul 28 2001
|
|
|
Search completed in 0.002 seconds
|
