id:A116360 - OEIS Search Results

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Smallest number that can be written as sum of n products of two successive primes, a(n)=-1 if no such number exists.

+0
5

1, 6, 30, 60, 90, 105, 120, 135, 143, 158, 155, 167, 173, 182, 185, 207, 197, 203, 212, 215, 221, 231, 227, 233, 239, 242, 256, 245, 251, 261, 257, 260, 263, 266, 282, 272, 275, 278, 281, 291, -1, 287, 290, 293, 296, 309, 312, 302, 305, 319, 308, 314, -1, 317, 322, 320 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`If a(n) <> -1: A116357(a(n))=n and A116357(m)<>n for m<n.`
	EXAMPLE	`Without proof: a(40) = -1 and a(52) = -1.`
	CROSSREFS	`Sequence in context: A024365 A057229 A120734 this_sequence A065800 A145010 A056835` `Adjacent sequences: A116357 A116358 A116359 this_sequence A116361 A116362 A116363`
	KEYWORD	`sign`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 12 2006`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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