A129216 Numbers m such that 10!*m-/+1 are twin primes.

14, 20, 39, 61, 70, 72, 84, 107, 136, 235, 279, 281, 282, 319, 324, 360, 369, 422, 451, 513, 539, 547, 594, 598, 611, 647, 673, 684, 744, 783, 809, 823, 851, 911, 918, 919, 935, 957, 968

Offset: 1

Author

Zak Seidov, Apr 04 2007

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Harvey P. Dale)

Crossrefs

Cf. A014574 (Average of twin prime pairs), A127545 (Multiples of 7 such that n -/+ 1 are twin primes).

Numbers m such that (N!*m -/+ 1) are twin primes: A129213 (N=7), A129214 (N=8), A129215 (N=9).

Programs

Mathematica

s={};Do[m=3628800k;If[PrimeQ[m-1]&&PrimeQ[m+1],AppendTo[s,k]],{k,1000}];s
With[{c=10!},Select[Range[1000],And@@PrimeQ[c #+{1,-1}]&]] (* Harvey P. Dale, Jun 23 2012 *)

Formula

10!*a(n) are terms in A014574.