|
Search: id:A007821
|
|
|
| A007821 |
|
Primes p(n) where n runs through the nonprimes. |
|
+0
24
|
|
| 2, 7, 13, 19, 23, 29, 37, 43, 47, 53, 61, 71, 73, 79, 89, 97, 101, 103, 107, 113, 131, 137, 139, 149, 151, 163, 167, 173, 181, 193, 197, 199, 223, 227, 229, 233, 239, 251, 257, 263, 269, 271, 281, 293, 307, 311, 313, 317, 337, 347, 349, 359, 373
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
A137588(a(n)) = n; a(n) = A000040(A018252(n)). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 28 2008
a(n)=prime(nonprime(n)); A000040 = A007821 U A006450. - Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Sep 24 2009
|
|
REFERENCES
|
C. Kimberling, Fractal sequences and interspersions, Ars Combinatoria, vol. 45 p 157 1997.
|
|
LINKS
|
R. Zumkeller, Table of n, a(n) for n = 1..1000
N. Fernandez, An order of primeness, F(p)
|
|
MAPLE
|
A007821 := proc(n) if isprime(n) = false then ithprime(n) fi end;
|
|
MATHEMATICA
|
Prime[ Select[ Range[75], !PrimeQ[ # ] &]] (from Robert G. Wilson v Mar 15 2004)
|
|
CROSSREFS
|
Cf. A049076, A049078, A049079, A049080, A049081, A058322, A058324, A058325, A058326, A058327, A058328, A093046, A006450.
Sequence in context: A019370 A001966 A155547 this_sequence A156007 A067774 A063637
Adjacent sequences: A007818 A007819 A007820 this_sequence A007822 A007823 A007824
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
mzerger(AT)cc4.adams.edu (Monte J. Zerger), Clark Kimberling (ck6(AT)evansville.edu)
|
|
|
Search completed in 0.002 seconds
|
