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A093013 Numbers n such that 10*n-3 and 10*n+3 are both primes. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Contains all terms of A093014.
LINKS
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
Sequence in context: A049045 A153766 A319301 * A272999 A278490 A188029
KEYWORD
nonn
AUTHOR
Ray Chandler, Mar 19 2004
STATUS
approved

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Last modified May 25 14:28 EDT 2024. Contains 372788 sequences. (Running on oeis4.)