id:A083681 - OEIS Search Results

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Sum of divisors of semiprimes.

+0
2

7, 12, 13, 18, 24, 24, 32, 36, 31, 42, 48, 54, 48, 60, 56, 72, 57, 72, 72, 80, 90, 96, 84, 96, 114, 96, 126, 108, 132, 120, 112, 128, 144, 120, 162, 152, 144, 180, 144, 133, 186, 168, 176, 160, 204, 192, 216, 168, 180, 222, 192, 240, 216, 192, 252, 183, 240, 270, 248 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n) = A000203(A001358(n)) = 1 + A020639(n) + A057427(A006530(n)-A020639(n))A006530(n) + A020639(n)A006530(n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 16 2003`
	EXAMPLE	`a(2)=12 because sum of divisors of 2nd semiprime i.e. 6 is 1+2+3+6=12.`
	CROSSREFS	`Sequence in context: A126710 A152199 A070420 this_sequence A048653 A075696 A061120` `Adjacent sequences: A083678 A083679 A083680 this_sequence A083682 A083683 A083684`
	KEYWORD	`easy,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jun 15 2003`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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