A115398 - OEIS

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A115398

Numbers n such that both n^2+1 and 2^n + 1 are semiprimes.

3, 5, 11, 12, 19, 28, 61, 64, 79, 92, 101, 104, 199, 356, 596, 692 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Intersection of A085722 and A092559.`
	EXAMPLE	`11 is OK because 11^2+1=122=261 (semiprime) and 2^11+1=2049=3683 (semiprime).`
	CROSSREFS	`Cf. A085722, A092559.` `Sequence in context: A006538 A066281 A072063 * A014597 A130603 A069977` `Adjacent sequences: A115395 A115396 A115397 * A115399 A115400 A115401`
	KEYWORD	`more,nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Mar 08 2006`

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Last modified February 14 23:16 EST 2012. Contains 205687 sequences.