A073897 a(1) = 1, a(n) = smallest odd or even number not occurring earlier according as n is prime or composite.

1, 3, 5, 2, 7, 4, 9, 6, 8, 10, 11, 12, 13, 14, 16, 18, 15, 20, 17, 22, 24, 26, 19, 28, 30, 32, 34, 36, 21, 38, 23, 40, 42, 44, 46, 48, 25, 50, 52, 54, 27, 56, 29, 58, 60, 62, 31, 64, 66, 68, 70, 72, 33, 74, 76, 78, 80, 82, 35, 84, 37, 86, 88, 90, 92, 94, 39

Offset

1,2

Links

Alois P. Heinz, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A073898.

Sequence in context: A227988 A182813 A334627 * A237058 A285297 A097465

Adjacent sequences: A073894 A073895 A073896 * A073898 A073899 A073900

Keyword

nonn

Author

Amarnath Murthy, Aug 18 2002

Extensions

More terms from Alois P. Heinz, Oct 29 2015

Status

approved