A074039 If (n, n+2) is the k-th twin prime pair then k else 0.

0, 0, 1, 0, 2, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset

1,5

Comments

A001359(a(n)) = n, A006512(a(n)) = n+2.

Links

Table of n, a(n) for n=1..99.

Crossrefs

Cf. A074038, A049084.

Sequence in context: A356303 A238429 A332671 * A047764 A022883 A284270

Adjacent sequences: A074036 A074037 A074038 * A074040 A074041 A074042

Keyword

nonn

Author

Reinhard Zumkeller, Aug 13 2002

Status

approved