login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A062370 a(n) = Sum_{i|n,j|n} sigma(i)*sigma(j)/sigma(gcd(i,j)), where sigma(n) = sum of divisors of n. 0
1, 10, 13, 45, 19, 130, 25, 150, 78, 190, 37, 585, 43, 250, 247, 429, 55, 780, 61, 855, 325, 370, 73, 1950, 174, 430, 358, 1125, 91, 2470, 97, 1122, 481, 550, 475, 3510, 115, 610, 559, 2850, 127, 3250, 133, 1665, 1482, 730, 145, 5577, 310, 1740, 715, 1935 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Multiplicative with a(p^e) = 1 + sum_{k=1..e} (2k+1)sigma(p^k). Mitch Harris May 24, 2005.

LINKS

Table of n, a(n) for n=1..52.

CROSSREFS

Cf. A000203, A060648.

Sequence in context: A102249 A195313 A219829 * A069960 A219715 A154142

Adjacent sequences:  A062367 A062368 A062369 * A062371 A062372 A062373

KEYWORD

nonn,mult

AUTHOR

Vladeta Jovovic, Jul 07 2001

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 17 00:02 EST 2018. Contains 317275 sequences. (Running on oeis4.)