id:A062370 - OEIS Search Results

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a(n) = Sum_{i|n,j|n} sigma(i)*sigma(j)/sigma(gcd(i,j)), where sigma(n) = sum of divisors of n.

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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; listen)

	OFFSET	`1,2`
	COMMENT	`Multiplicative with a(p^e) = 1 + sum_{k=1..e} (2k+1)sigma(p^k). Mitch Harris (Harris.Mitchell(AT)mgh.harvard.edu) May 24, 2005.`
	CROSSREFS	`Cf. A000203, A060648.` `Sequence in context: A074346 A126973 A102249 this_sequence A069960 A154142 A108761` `Adjacent sequences: A062367 A062368 A062369 this_sequence A062371 A062372 A062373`
	KEYWORD	`nonn,mult`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 07 2001`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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