The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A174042 Places n for which A046132(n) and A006512(n) is a twin prime pair. 1
 1, 9, 10, 24, 28, 67, 195, 361, 362, 382, 459, 462, 470, 759, 765, 766, 794, 864, 869, 909, 1189, 1300, 1303, 1374, 1378, 1642, 1657, 1659, 3727, 3755, 4187, 4368, 4413, 4677, 4684, 4721, 4927, 4945, 5221, 5270, 5313, 5409, 5627, 5945, 7587, 7588, 7789 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE 1 is in the sequence because A046132(1)=7 and A006512(1)=5 are twin primes. MAPLE A023200 := proc(n) option remember; if n = 1 then 3; else p := nextprime(procname(n-1)) ; while not isprime(p+4) do p := nextprime(p) ; end do: p ; end if; end proc: A046132 := proc(n) 4+A023200(n) ; end proc: A001359 := proc(n) option remember; if n = 1 then 3; else p := nextprime(procname(n-1)) ; while not isprime(p+2) do p := nextprime(p) ; end do: p ; end if; end proc: A006512 := proc(n) 2+A001359(n) ; end proc: for n from 1 do if A046132(n)+2 = A006512(n) or A046132(n) = A006512(n)+2 then printf("%d, \n", n); end if; end do: # R. J. Mathar, Nov 03 2011 CROSSREFS Cf. A006512, A046132. Sequence in context: A309485 A228378 A326464 * A263261 A290275 A156787 Adjacent sequences:  A174039 A174040 A174041 * A174043 A174044 A174045 KEYWORD nonn AUTHOR Vladimir Shevelev, Mar 06 2010 EXTENSIONS Extended beyond 28 by R. J. Mathar, Nov 03 2011 More terms from Michel Marcus, Dec 19 2018 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 19 21:42 EDT 2020. Contains 337184 sequences. (Running on oeis4.)