A059790 Distance between 2*(n-th prime) and nearest prime.

1, 1, 1, 1, 1, 3, 3, 1, 1, 1, 1, 1, 1, 3, 3, 1, 5, 5, 3, 3, 3, 1, 1, 1, 1, 3, 5, 3, 5, 1, 3, 1, 3, 1, 5, 5, 1, 5, 3, 1, 1, 3, 1, 3, 3, 1, 1, 3, 3, 1, 1, 1, 3, 1, 5, 3, 3, 1, 3, 1, 3, 1, 1, 3, 5, 3, 1, 1, 3, 3, 3, 1, 1, 3, 1, 3, 5, 3, 5, 3, 1, 3, 1, 3, 1, 1, 9, 3, 3, 3, 3, 5, 3, 1, 1, 3, 1, 3, 3, 5, 1, 3, 3, 9, 9

Offset

0,6

Links

Table of n, a(n) for n=0..104.

Example

Distance 1 means that either 2p+1 or 2p-1 is also prime.

Maple

with(numtheory): [seq(min(2*ithprime(k)-prevprime(2*ithprime(k)), nextprime(2*ithprime(k))-2*ithprime(k)), k=1..256)];

Crossrefs

A005382-A005385.

Sequence in context: A186028 A225054 A355604 * A307156 A326057 A130778

Adjacent sequences: A059787 A059788 A059789 * A059791 A059792 A059793

Keyword

nonn

Author

Labos Elemer, Feb 22 2001

Status

approved