A093013 Numbers n such that 10*n-3 and 10*n+3 are both primes.

1, 2, 4, 5, 7, 10, 11, 16, 17, 23, 26, 28, 31, 35, 37, 46, 56, 59, 61, 65, 68, 73, 86, 88, 95, 98, 109, 110, 112, 119, 122, 128, 130, 137, 143, 145, 149, 161, 166, 175, 178, 187, 191, 199, 200, 214, 221, 224, 227, 229, 238, 242, 247, 266, 268, 269, 271, 280, 284, 290

Offset

1,2

Comments

Contains all terms of A093014.

Links

G. C. Greubel, Table of n, a(n) for n = 1..5000

Formula

a(n) = A091992(n)/2.

Mathematica

Select[Range[600], PrimeQ[10*#-3] && PrimeQ[10*#+3] &] (* G. C. Greubel, Feb 05 2019 *)

Prog

(PARI) for(n=1, 290, if(isprime(10*n-3)&&isprime(10*n+3), print1(n, ", "))) \\ Jinyuan Wang, Feb 06 2019

Crossrefs

Cf. A091992, A093014.

Sequence in context: A049045 A153766 A319301 * A272999 A278490 A188029

Adjacent sequences: A093010 A093011 A093012 * A093014 A093015 A093016

Keyword

nonn

Author

Ray Chandler, Mar 19 2004

Status

approved