login
This site is supported by donations to The OEIS Foundation.

 

Logo

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A230460 Prime(2*prime(n)). 5
7, 13, 29, 43, 79, 101, 139, 163, 199, 271, 293, 373, 421, 443, 491, 577, 647, 673, 757, 821, 839, 929, 983, 1061, 1181, 1231, 1277, 1307, 1361, 1429, 1609, 1667, 1759, 1789, 1973, 1997, 2083, 2161, 2243, 2339, 2411, 2441, 2633, 2663, 2707, 2729, 2917 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A subsequence of A031378 (subsequence of A031215) and of A106349, which are both subsequences of A007821 which is the complement of A006450 in the primes A000040.

LINKS

M. F. Hasler, Table of n, a(n) for n = 1..1000

FORMULA

a(n) ~ 2n log(n) log(2n log(n)) ~ 2n (log n)^2.

a(n) = A000040(A100484(n)). - Omar E. Pol, Oct 19 2013

EXAMPLE

a(3) = 29 because the third prime is 5, and 2 * 5 = 10, and then we see that the tenth prime is 29.

a(4) = 43 because the fourth prime is 7, and 2 * 7 = 14, and then we see that the fourteenth prime is 43.

MATHEMATICA

Prime[2Prime[Range[50]]] (* Alonso del Arte, Oct 19 2013 *)

PROG

(PARI) A230460=n->prime(2*prime(n))

CROSSREFS

Cf. A217622.

Sequence in context: A283650 A045463 A082221 * A182624 A096333 A133325

Adjacent sequences:  A230457 A230458 A230459 * A230461 A230462 A230463

KEYWORD

nonn,easy

AUTHOR

M. F. Hasler, Oct 19 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified August 17 23:58 EDT 2017. Contains 290682 sequences.