A108955 - OEIS

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A108955

Floor(Li(2n) - Li(n)).

1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 17, 17, 17 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	FORMULA	`Li(x) = Int(t=2, x, dt/log(t)) = Logarithmic Integral.`
	PROG	`(PARI) L(n) = for(x=2, n, y=Li(2*x)-Li(x); print1(floor(y)", ")) Li(x) = \ Logarithmic integral { -eint1(log(1/x)) }`
	CROSSREFS	`Sequence in context: A052146 A097882 * A108956 A135297 A176146 A171481` `Adjacent sequences: A108952 A108953 A108954 * A108956 A108957 A108958`
	KEYWORD	`easy,nonn`
	AUTHOR	`Cino Hilliard (hillcino368(AT)gmail.com), Jul 22 2005`

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.