A209321 - OEIS

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A209321

Indices n for which A209312(n)=2.

9, 11, 14, 17, 26, 31, 38, 46, 62, 70, 74, 86, 94, 118, 134, 194, 206, 278, 286, 566, 598, 778, 842, 934, 1006, 1082, 1214, 1238, 1546, 1574, 1726, 1858, 2018, 2278, 2474, 2774, 3142, 3686 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Many of these seem to be even semiprimes.` `Is this sequence infinite, and if so, can someone exhibit an explicitely calculable subsequence?`
	LINKS	`Table of n, a(n) for n=1..38.`
	CROSSREFS	`Sequence in context: A341080 A279519 A307188 * A212816 A183980 A101754` `Adjacent sequences: A209318 A209319 A209320 * A209322 A209323 A209324`
	KEYWORD	`nonn,more`
	AUTHOR	`M. F. Hasler, Jan 19 2013`
	STATUS	`approved`

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Last modified April 12 15:00 EDT 2021. Contains 342921 sequences. (Running on oeis4.)