id:A129613 - OEIS Search Results

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a(n) is the smallest natural number m such that 2^(2^k) + m is prime for k=0,1,...,n.

+0
4

1, 1, 1, 1, 1, 15, 66747, 475425, 12124167, 14899339905 (list; graph; listen)

	OFFSET	`0,6`
	COMMENT	`The first five terms of this sequence correspond to known Fermat primes. Next term is greater than 5*10^8.`
	CROSSREFS	`Cf. A090872, A090874, A090875, A129614, A129615.` `Sequence in context: A013756 A078185 A096224 this_sequence A013802 A084878 A013874` `Adjacent sequences: A129610 A129611 A129612 this_sequence A129614 A129615 A129616`
	KEYWORD	`nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), May 13 2007, May 16 2007`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.