A111756 - OEIS

A111756

Greatest common divisors of consecutive terms of A091780.

3, 3, 3, 3, 5, 5, 5, 5, 5, 3, 7, 7, 7, 7, 5, 5, 9, 9, 3, 3, 11, 11, 11, 11, 5, 5, 13, 13, 13, 13, 3, 3, 17, 17, 17, 17, 5, 3, 19, 19, 19, 19, 5, 7, 7, 21, 3, 3, 23, 23, 23, 23, 5, 5, 3, 27, 3, 11, 7, 7, 13, 3, 29, 29, 29, 29, 5, 3, 31, 31, 31, 31, 5, 5, 3, 9, 3, 3, 37, 37, 37, 37, 5, 11, 11, 11

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,1

COMMENTS

It appears that each prime p>2 first appears in this sequence in a run of length 4, except for prime(3)=5, which first occurs in a run of length 5. This has been confirmed through prime(135)=761.

LINKS

Table of n, a(n) for n=0..85.

EXAMPLE

The fifth and sixth terms of A091780 are 15 and 10, respectively, so a(5)=5.

CROSSREFS

Cf. A091780.

Sequence in context: A162220 A118911 A190268 * A130821 A352226 A129756

Adjacent sequences: A111753 A111754 A111755 * A111757 A111758 A111759

KEYWORD

nonn

AUTHOR

John W. Layman, Nov 21 2005

STATUS

approved