A080031 - OEIS

A080031

a(n) is taken to be the smallest positive integer not already present which is consistent with the condition "n is a member of the sequence if and only if a(n) is congruent to 2 mod 3".

1, 2, 5, 4, 8, 11, 7, 14, 17, 10, 20, 23, 13, 26, 29, 16, 32, 35, 19, 38, 41, 22, 44, 47, 25, 50, 53, 28, 56, 59, 31, 62, 65, 34, 68, 71, 37, 74, 77, 40, 80, 83, 43, 86, 89, 46, 92, 95, 49, 98, 101, 52, 104, 107, 55, 110, 113, 58, 116, 119, 61, 122, 125, 64, 128, 131, 67

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

OFFSET

0,2

COMMENTS

A permutation of all positive non-multiples of 3; also a permutation of A080030. - Matthew Vandermast, Mar 21 2003

LINKS

Table of n, a(n) for n=0..66.

B. Cloitre, N. J. A. Sloane and M. J. Vandermast, Numerical analogues of Aronson's sequence, J. Integer Seqs., Vol. 6 (2003), #03.2.2.

B. Cloitre, N. J. A. Sloane and M. J. Vandermast, Numerical analogues of Aronson's sequence (math.NT/0305308)

FORMULA

a(3m)=3m+1, a(3m+1)=6m+2, a(3m+2)=6m+5. [corrected by Georg Fischer, Jun 08 2022]

CROSSREFS

Cf. A079000, A079313, A080029, A080030.

Sequence in context: A286015 A183542 A328203 * A198193 A316905 A214533

Adjacent sequences: A080028 A080029 A080030 * A080032 A080033 A080034

KEYWORD

easy,nonn

AUTHOR

N. J. A. Sloane, Mar 14 2003

EXTENSIONS

More terms from Matthew Vandermast, Mar 21 2003

STATUS

approved