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

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A060231 Smaller of twin primes whose middle term is a multiple of A002110(5)=2310. 5
 2309, 9239, 11549, 25409, 34649, 43889, 55439, 78539, 92399, 110879, 117809, 133979, 152459, 168629, 180179, 224069, 226379, 230999, 244859, 251789, 267959, 270269, 284129, 297989, 300299, 309539, 314159, 316469, 330329, 376529, 390389 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Number of terms less than 10^k: 0, 0, 0, 0, 2, 9, 66, 422, 3255, ... - Muniru A Asiru, Jan 29 2018 LINKS Muniru A Asiru, Table of n, a(n) for n = 1..1000 EXAMPLE For the pair {9239,9241} (9239+9241)/2 = 4*2310. MAPLE select(n->isprime(n) and isprime(n+2), [seq(2310*k-1, k=1..10^3)]);  # Muniru A Asiru, Jan 29 2018 MATHEMATICA Select[2310*Range[200], And@@PrimeQ[#+{1, -1}]&]-1 (* Harvey P. Dale, Aug 23 2013 *) PROG (GAP) P:=Filtered([1..10^5], IsPrime);; P1:=List(Filtered(Filtered(List([1..Length(P)-1], n -> [P[n], P[n+1]]), i -> i[2]-i[1] = 2), j -> (j[1]+j[2]) mod 2310 = 0), k -> k[1]); # Muniru A Asiru, Jan 29 2018 (PARI) is(n)=(n+1)%2310==0 && isprime(n+2) && isprime(n) \\ Charles R Greathouse IV, Jan 30 2018 CROSSREFS Cf. A001359, A002110, A060229, A060230. Sequence in context: A247698 A247839 A280659 * A285487 A285744 A051270 Adjacent sequences:  A060228 A060229 A060230 * A060232 A060233 A060234 KEYWORD nonn AUTHOR Labos Elemer, Mar 21 2001 EXTENSIONS Minor edits by Ray Chandler, Apr 02 2009 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 November 26 03:20 EST 2020. Contains 338632 sequences. (Running on oeis4.)