id:A068354 - OEIS Search Results

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Numbers n such that sigma(n)*tau(n)>prime(2*n) where sigma(n) is the sum of divisors of n and tau(n) the number of divisors of n = A000005(n).

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4, 6, 8, 10, 12, 16, 18, 20, 24, 28, 30, 32, 36, 40, 42, 44, 45, 48, 50, 52, 54, 56, 60, 64, 66, 70, 72, 78, 80, 84, 88, 90, 96, 100, 102, 104, 105, 108, 110, 112, 114, 120, 126, 128, 130, 132, 135, 136, 138, 140, 144, 150, 152, 154, 156, 160, 162, 165, 168, 170 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`PARI : for(n=1, 1000, if(sigma(n)numdiv(n)>prime(2n), print1(n, ", ")))`
	CROSSREFS	`Adjacent sequences: A068351 A068352 A068353 this_sequence A068355 A068356 A068357` `Sequence in context: A051756 A053226 A074827 this_sequence A075027 A076298 A034288`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 28 2002`

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Last modified October 5 16:50 EDT 2008. Contains 144613 sequences.

AT&T Labs Research