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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A020482 Greatest p with p, q both prime, p+q = 2n. 24
2, 3, 5, 7, 7, 11, 13, 13, 17, 19, 19, 23, 23, 23, 29, 31, 31, 31, 37, 37, 41, 43, 43, 47, 47, 47, 53, 53, 53, 59, 61, 61, 61, 67, 67, 71, 73, 73, 73, 79, 79, 83, 83, 83, 89, 89, 89, 79, 97, 97, 101, 103, 103, 107, 109, 109, 113, 113, 113, 109, 113, 113, 109, 127, 127, 131, 131 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

a(n) = A171637(n,A035026(n)). - Reinhard Zumkeller, Mar 03 2014

LINKS

H. J. Smith, Table of n, a(n) for n = 2..20000

MATHEMATICA

a[n_] := {p, q} /. {ToRules @ Reduce[p+q == 2*n, {p, q}, Primes]} // Max; Table[a[n], {n, 2, 100}] (* Jean-Fran├žois Alcover, Dec 19 2013 *)

PROG

(Haskell)

a020482 = last . a171637_row  -- Reinhard Zumkeller, Mar 03 2014

(PARI) a(n)=forprime(q=2, n, if(isprime(2*n-q), return(2*n-q))) \\ Charles R Greathouse IV, Apr 28 2015

CROSSREFS

Cf. A060264, A020481.

Sequence in context: A195882 A156900 A039734 * A060308 A224911 A270176

Adjacent sequences:  A020479 A020480 A020481 * A020483 A020484 A020485

KEYWORD

nonn

AUTHOR

David W. Wilson

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 December 4 19:31 EST 2016. Contains 278755 sequences.