A127545 - OEIS

A127545

Multiples of 7, k, such that k +/- 1 are twin primes.

42, 420, 462, 882, 1050, 1092, 1302, 1428, 1722, 1932, 2142, 2268, 2310, 2688, 2730, 3360, 3528, 3822, 4158, 4242, 4788, 5418, 5502, 5880, 6090, 6132, 6300, 6552, 6762, 7308, 7350, 7560, 8232, 8820, 8862, 9240, 9282, 10038, 10332, 10458, 10500, 10710

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Range[7, 10710, 7], PrimeQ[#-1]&&PrimeQ[#+1]&] (* James C. McMahon, Jan 01 2025 *)

PROG

(PARI) a(n) = !(n %7) && isprime(n+1) && isprime(n-1); \\ Michel Marcus, Oct 11 2013

CROSSREFS

Intersection of A008589 and A014574.

Sequence in context: A224455 A114928 A364943 * A027318 A251425 A242144

Adjacent sequences: A127542 A127543 A127544 * A127546 A127547 A127548

KEYWORD

nonn

AUTHOR

Zak Seidov, Apr 01 2007

EXTENSIONS

Name edited by James C. McMahon, Jan 01 2025

STATUS

approved