|
Search: id:A065827
|
|
|
| A065827 |
|
Sum of squares of divisors of square numbers. |
|
+0
1
|
|
| 1, 21, 91, 341, 651, 1911, 2451, 5461, 7381, 13671, 14763, 31031, 28731, 51471, 59241, 87381, 83811, 155001, 130683, 221991, 223041, 310023, 280371, 496951, 406901, 603351, 597871, 835791, 708123, 1244061, 924483, 1398101, 1343433
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
Harry J. Smith, Table of n, a(n) for n=1,...,500
|
|
FORMULA
|
Multiplicative with a(p^e) = (p^(4*e+2)-1)/(p^2-1).
|
|
PROGRAM
|
(Other) sage: [sigma(n^2, 2)for n in xrange(1, 34)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 13 2009]
(PARI) { for (n=1, 500, a=sigma(n^2, 2); write("b065827.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 01 2009]
|
|
CROSSREFS
|
Cf. A001157, A065764.
Sequence in context: A045016 A158540 A020248 this_sequence A143843 A119109 A144856
Adjacent sequences: A065824 A065825 A065826 this_sequence A065828 A065829 A065830
|
|
KEYWORD
|
mult,nonn
|
|
AUTHOR
|
Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 06 2001
|
|
|
Search completed in 0.002 seconds
|
