A079355 a(1) = 1; a(n) = a(n-1)-3 if n is already in the sequence, a(n) = a(n-1)+4 otherwise.

1, 5, 9, 13, 10, 14, 18, 22, 19, 16, 20, 24, 21, 18, 22, 19, 23, 20, 17, 14, 11, 8, 5, 2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 35, 32, 36, 40, 37, 41, 38, 35, 39, 43, 47, 51, 55, 52, 56, 60, 64, 61, 58, 62, 66, 63, 60, 64, 61, 65, 62, 59, 56, 53, 50, 47, 44, 48, 52, 56, 60, 64, 68

Offset

1,2

Links

Table of n, a(n) for n=1..72.

Formula

a(n) = n+b(n)-22 where b(n) is the 42-periodic sequence (22, 25, 28, 31, 27, 30, 33, 36, 32, 28, 31, 34, 30, 26, 29, 25, 28, 24, 20, 16, 12, 8, 4, 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 23, 19, 22, 25, 21, 24, 20, 16, 19)

Crossrefs

Cf. A079357.

Sequence in context: A277617 A103703 A143706 * A080781 A079357 A080455

Adjacent sequences: A079352 A079353 A079354 * A079356 A079357 A079358

Keyword

nonn,hear

Author

Benoit Cloitre, Feb 14 2003

Status

approved