A175636 Maximal (nonzeros) run length of semiprimes of the form k+4, k+8, k+12,.., where k is a non-semiprime.

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

Offset

1,2

Links

Table of n, a(n) for n=1..105.

Example

a(1)=1 because k=0=non-semiprime and 0+4=4=semiprime; a(2)=3 because k=2=non-semiprime and 2+4=6=semiprime, 2+8=10=semiprime, 2+12=14=semiprime; a(3)=1 because k=5=non-semiprime and 5+4=9=semiprime.

Crossrefs

Cf. A175612, A175632.

Sequence in context: A300682 A300605 A301330 * A352935 A364757 A204253

Adjacent sequences: A175633 A175634 A175635 * A175637 A175638 A175639

Keyword

nonn

Author

Vladislav-Stepan Malakovsky & Juri-Stepan Gerasimov, Aug 01 2010

Status

approved