id:A154367 - OEIS Search Results

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Numbers n such that sum of prime factors of composite(n) = prime and smallest prime factor composite(n) + largest prime factor of composite(n) = composite.

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18, 30, 36, 39, 53, 54, 73, 76, 86, 112, 113, 116, 120, 126, 132, 134, 141, 146, 160, 163 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`If composite(k=18)=28=227, 2+2+7=13(prime) and 2+7=9(composite), then 18=a(1). If composite(k=30)=45=335, 3+3+5=11(prime) and 3+5=8(composite), then 30=a(2), etc.`
	CROSSREFS	`Cf. Primes in A000040. Composites in A002808.` `Sequence in context: A144833 A032612 A151700 this_sequence A161164 A092357 A167515` `Adjacent sequences: A154364 A154365 A154366 this_sequence A154368 A154369 A154370`
	KEYWORD	`nonn`
	AUTHOR	`Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 08 2009`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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