A093311 a(n) is the k-th upper twin prime, where k = n!.

5, 5, 7, 43, 463, 4639, 51349, 563011, 6445993, 80358601, 1066687471, 15116681443, 228312888439

Offset

0,1

Links

Table of n, a(n) for n=0..12.

Formula

From Amiram Eldar, Jul 07 2024: (Start)

a(n) = A006512(n!).

a(n) = A093310(n) + 2. (End)

Prog

(PARI)
twinu(n) = { local(c, x); c=0; x=1; while(c<n, if(isprime(prime(x)+2), c++); x++; ); return(prime(x)) }
g(n) = for(x=0, n, print1(twinu(x!), ", "))

Crossrefs

Cf. A006512, A093310.

Sequence in context: A019204 A301733 A114367 * A364909 A328344 A100128

Adjacent sequences: A093308 A093309 A093310 * A093312 A093313 A093314

Keyword

nonn,more

Author

Cino Hilliard, Apr 25 2004

Extensions

a(9)-a(12) from Giovanni Resta, Jun 10 2018

Status

approved