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A164510 First differences of A071904 (Odd composite numbers). 2
6, 6, 4, 2, 6, 2, 4, 6, 4, 2, 4, 2, 6, 2, 4, 6, 2, 4, 4, 2, 4, 2, 2, 4, 6, 6, 4, 2, 2, 2, 2, 2, 4, 4, 2, 6, 2, 2, 2, 6, 2, 4, 2, 4, 4, 2, 4, 2, 6, 2, 2, 2, 6, 6, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 6, 4, 2, 6, 2, 2, 2, 4, 2, 4, 2, 4, 2, 6, 2, 4, 6, 2, 2, 2, 4, 2, 2, 2, 2, 2, 4, 6, 4, 2, 2, 2, 2, 2, 4, 2, 4, 2, 2, 2, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Are all terms <=6?

This is A067970 without its first term. [From R. J. Mathar, Aug 17 2009]

Yes, all terms are at most 6. For a value of 8, we have to have p, p+2, p+4 all prime, and this is possible only for p=3. As a result, 1 would have to be an odd composite number, which it is not. Therefore all terms are <=6. [From J. Lowell, Aug 17 2009]

LINKS

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

CROSSREFS

A071904

Sequence in context: A094888 A159702 A255188 * A019957 A099405 A090966

Adjacent sequences:  A164507 A164508 A164509 * A164511 A164512 A164513

KEYWORD

nonn

AUTHOR

Zak Seidov, Aug 14 2009

STATUS

approved

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Last modified October 18 23:44 EDT 2021. Contains 348071 sequences. (Running on oeis4.)