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A079279 a(n)=n for n<=3; for n>3, a(n) is next integer sharing common factors with 1 or 2 of previous 3 terms. 2
1, 2, 3, 4, 8, 9, 10, 14, 15, 16, 21, 22, 26, 27, 28, 32, 33, 34, 38, 39, 40, 44, 45, 46, 51, 52, 56, 57, 58, 62, 63, 64, 68, 69, 70, 74, 75, 76, 81, 82, 86, 87, 88, 92, 93, 94, 98, 99, 100, 104, 105, 106, 111, 112, 116, 117, 118, 122, 123, 124, 128, 129, 130, 134, 135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Does every sequence generated according to this rule, no matter which three initial terms are chosen, eventually fall into the same pattern with respect to the modulus 210 and thus have almost all of its terms in common with A079279?

LINKS

Table of n, a(n) for n=1..65.

FORMULA

Sequence includes all 3 mod 6 and 4 mod 6 numbers; all 2 mod 6 numbers except those congruent to 20 mod 30; all numbers congruent to 203 and 204 mod 210; and no other numbers except 1.

EXAMPLE

5, 6, 7 and 8 have factors in common with 0, 3, 0 and 2 (respectively) of terms a(2) through a(4) (2, 3 and 4); therefore a(5)=8.

CROSSREFS

Sequence in context: A246293 A047228 A032968 * A246444 A045577 A111020

Adjacent sequences:  A079276 A079277 A079278 * A079280 A079281 A079282

KEYWORD

easy,nonn

AUTHOR

Matthew Vandermast, Feb 07 2003

STATUS

approved

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Last modified September 17 12:41 EDT 2019. Contains 327131 sequences. (Running on oeis4.)