id:A100018 - OEIS Search Results

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Least a(n) such that a(n)*2^n*(2^n-1)-1 and a(n)*2^n*(2^n-1)+1 are twin primes.

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2, 1, 48, 1, 30, 25, 33, 12, 30, 6, 117, 22, 471, 119, 255, 98, 180, 29, 153, 48, 399, 135, 267, 20, 426, 320, 213, 391, 714, 216, 1395, 148, 915, 65, 2703, 65, 525, 364, 573, 173, 240, 1239, 657, 205, 135, 30, 1080, 82, 1056, 604, 3102, 148, 279, 661, 1962, 435, 306 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`22^1(2^1-1)-1 = 3` `22^1(2^1-1)+1 = 5, 3 and 5 twin primes so a(1)=2`
	CROSSREFS	`Adjacent sequences: A100015 A100016 A100017 this_sequence A100019 A100020 A100021` `Sequence in context: A038022 A038021 A127609 this_sequence A109347 A054210 A092650`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Nov 19 2004`

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.

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