|
Search: id:A119381
|
|
|
| A119381 |
|
Primes p(n) for which (p(n-1) + p(n+2)) / p(n) = 2. |
|
+0
7
|
|
| 37, 67, 277, 479, 613, 631, 809, 1297, 1471, 1607, 1663, 1721, 1783, 1867, 1901, 1931, 1993, 2137, 2377, 2411, 2521, 2683, 2797, 2879, 3359, 3571, 3917, 4391, 4513, 4621, 5413, 5437, 5477, 5647, 6299, 7321, 7393, 7873, 7901, 8087, 8819, 9007, 10301
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
FORMULA
|
a(n) = Prime(A119382(n)), where Prime(n) is the n-th prime. - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jul 26 2006
|
|
EXAMPLE
|
In the ordered set of primes we have ...271,277,281,283... and (271+283)/277 = 2, therefore 277 belongs in this sequence.
|
|
MATHEMATICA
|
Prime[Select[Range[2, 1500], (Prime[ # - 1] + Prime[ # + 2])/(Prime[ # ]) == 2 &]] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jul 26 2006
|
|
CROSSREFS
|
Cf. A119382.
Cf. A119382.
Sequence in context: A141163 A063461 A105462 this_sequence A138396 A044103 A044484
Adjacent sequences: A119378 A119379 A119380 this_sequence A119382 A119383 A119384
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Axel Harvey (ax(AT)hirsig.ca), Jul 25 2006
|
|
EXTENSIONS
|
More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jul 26 2006
|
|
|
Search completed in 0.002 seconds
|
