|
| |
|
|
A142348
|
|
Primes of the form (p(n)+r(n)), where p(n)=n-th prime and r(n)=n-th nonprime.
|
|
0
| |
|
|
2, 13, 19, 31, 37, 47, 61, 103, 137, 149, 293, 313, 349, 397, 421, 439, 463, 491, 587, 727, 751, 863, 929, 1049, 1153, 1187, 1229, 1289, 1297, 1361, 1427, 1483, 1493, 1553, 1571, 1601, 1741, 1787, 1847, 1867, 1933, 1997, 2027, 2069, 2131, 2239, 2389, 2411
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
EXAMPLE
| If n=1, then p(1)+r(1)=2+0=2=a(1).
If n=4, then p(4)+r(4)=7+6=13=a(2).
If n=5, then p(5)+r(5)=11+8=19=a(3).
If n=8, then p(8)+r(8)=19+12=31=a(4).
If n=9, then p(9)+r(9)=23+14=37=a(5), etc.
|
|
|
CROSSREFS
| Cf. A000040, A141468.
Sequence in context: A122139 A122136 A067208 * A181686 A206462 A020601
Adjacent sequences: A142345 A142346 A142347 * A142349 A142350 A142351
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Sep 19 2008
|
|
|
EXTENSIONS
| Corrected (239 removed, 1847 removed, 1997 inserted) by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 28 2010
|
| |
|
|
