id:A122488 - OEIS Search Results

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Numbers n such that 1+2n+3n^2 is semiprime.

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	OFFSET	`1,2`
	COMMENT	`Cf. A086285 (Numbers n such that 1+2n+3n^2 is prime).`
	EXAMPLE	`n=3 is OK because 1+2n+3n^2=34=217 (semiprime)` `n=4 is OK because 1+2n+3n^2=57=319 (semiprime), etc.`
	CROSSREFS	`Cf. A086285.` `Sequence in context: A099352 A047207 A039132 this_sequence A039095 A001957 A100966` `Adjacent sequences: A122485 A122486 A122487 this_sequence A122489 A122490 A122491`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Oct 20 2006`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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