A123677 - OEIS

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A123677

Primes p such that Lucas[Prime[p]] is prime, where Lucas[k] = A000032[k].

3, 5, 7, 11, 13, 71, 113, 643, 769, 13681 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Numbers n such that Lucas[Prime[n]] is prime are listed in A120561[n] = {1,3,4,5,6,7,8,11,12,13,15,16,18,20,22,30,65,71,96,112,113,...}. a(n) are the primes in A120561[n]. Indices of prime Lucas numbers are listed in A001606[n] = {0,2,4,5,7,8,11,13,16,17,19,31,37,41,47,53,61,71,79,113,...}.`
	FORMULA	`a(n) = Prime[ A123678[n] ].`
	CROSSREFS	`Cf. A000032, A123678, A120561, A001606, A119984, A122534.` `Sequence in context: A093988 A175914 A108817 * A133954 A087325 A072151` `Adjacent sequences: A123674 A123675 A123676 * A123678 A123679 A123680`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 05 2006`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.