id:A140141 - OEIS Search Results

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Positions of second appearances of primes in A039649.

+0
7

2, 4, 8, 9, 22, 21, 32, 27, 46, 58, 62, 57, 55, 49, 94, 106, 118, 77, 134, 142, 91, 158, 166, 115, 119, 125, 206, 214, 133, 145, 254, 262, 274, 278, 298, 302, 169, 243, 334, 346, 358, 209, 382, 221, 394, 398, 422, 446, 454, 458, 295, 478, 287, 502, 512, 526, 538 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The first occurrence of a prime p in A039649 is not interesting because for an odd prime p it is evidently p.` `Since phi(p) = phi(2p) = p-1 for odd prime p, then for the n-th odd prime p_n we have p_n < a(n) <= 2p_n.`
	CROSSREFS	`Cf. A039649, A000010, A000040.` `Adjacent sequences: A140138 A140139 A140140 this_sequence A140142 A140143 A140144` `Sequence in context: A065391 A111261 A046685 this_sequence A088274 A118418 A074810`
	KEYWORD	`nonn`
	AUTHOR	`Vladimir Shevelev (shevelev(AT)bgu.ac.il), May 10 2008`
	EXTENSIONS	`Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 20 2008`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

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