id:A117360 - OEIS Search Results

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Numbers m such that m and 2*m+1 have the same number of prime factors.

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2, 3, 4, 5, 10, 11, 23, 25, 29, 34, 38, 40, 41, 46, 52, 53, 55, 57, 76, 77, 83, 89, 91, 93, 106, 113, 118, 123, 129, 130, 131, 133, 143, 145, 159, 161, 169, 171, 172, 173, 177, 179, 185, 191, 201, 203, 205, 206, 212, 213, 218, 220, 226, 233, 235, 238, 239, 251 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A001222(a(n)) = A001222(2*a(n)+1);` `Sophie Germaine primes are a subsequence, see A005384.`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000 [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 08 2009]`
	EXAMPLE	`m=52=2213, 252+1=105=35*7, therefore 52 is a term.`
	CROSSREFS	`Sequence in context: A032884 A023787 A032983 this_sequence A074821 A076707 A032940` `Adjacent sequences: A117357 A117358 A117359 this_sequence A117361 A117362 A117363`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 10 2006`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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