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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

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Last modified November 26 03:20 EST 2020. Contains 338632 sequences. (Running on oeis4.)