|
| |
|
|
A140141
|
|
Positions of second appearances of primes in A039649.
|
|
6
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| 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.
Sequence in context: A111261 A177404 A046685 * A088274 A118418 A074810
Adjacent sequences: A140138 A140139 A140140 * A140142 A140143 A140144
|
|
|
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
|
| |
|
|
