A123173 - OEIS

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A123173

Least semiprime s whose Merten's function M(s) = n.

33, 9, 4, 39, 94, 95, 341 (list; graph; refs; listen; history; internal format)

	OFFSET	`-3,1`
	FORMULA	`a(n) = Min[s in A001358 and A002321(s) = n].`
	EXAMPLE	`a(-3) = 33 = 3 * 11 = the first semiprime s for which the Mertens function M(s) = -3.` `a(-2) = 9 = 3^2 = the first semiprime s for which the Mertens function M(s) = -2.` `a(-1) = 4 = 2^2 = the first semiprime s for which the Mertens function M(s) = -1.` `a(0) = 39 = 3 * 13 = Min[A001358 INTERSECTION A028442] = the first semiprime s for which the Mertens function M(s) = 0.` `a(1) = 94 = 2 * 47 = Min[A001358 INTERSECTION A118684] = the first semiprime s for which the Mertens function M(s) = 1.` `a(2) = 95 = 5 * 19 = the first semiprime s for which the Mertens function M(s) = 2.` `a(3) = 341 = 11 * 31 = the first semiprime s for which the Mertens function M(s) = 3.`
	CROSSREFS	`Cf. A001358, A002321, A028442, A118684.` `Sequence in context: A113467 A113458 A120584 * A147021 A200897 A138839` `Adjacent sequences: A123170 A123171 A123172 * A123174 A123175 A123176`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Oct 02 2006`

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Last modified February 16 09:27 EST 2012. Contains 205904 sequences.