A074327 Smaller of twin primes arising in A074326.

3, 311, 1619, 3671, 1742537, 148948139, 2777105129, 16149760533341, 10082409897709157

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Formula

a(n) = prime(m) where m=2^x and prime(m+1)-prime(m) = 2.

a(n) = A033844(A074326(n)). - Michel Marcus, Aug 28 2019

Example

8th term in A074326 is 39, so prime[549755813888]=16149760533341=a(8) and 16149760533343 is the larger twin.

Mathematica

s=0; Do[s=Prime[1+2^n]-Prime[2^n]; If[s==2, Print[Prime[2^n]]], {n, 1, 40}]

Crossrefs

Cf. A051439, A033844, A073798, A000079, A074325, A074326.

Sequence in context: A085319 A123032 A132305 * A179109 A316329 A062333

Adjacent sequences: A074324 A074325 A074326 * A074328 A074329 A074330

Keyword

more,nonn

Author

Labos Elemer, Aug 21 2002

Extensions

Corrected and extended by Michel Marcus, Aug 28 2019

Status

approved