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

Author

Amarnath Murthy, Aug 18 2002

Keywords

• nonn

Links

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

Crossrefs

Cf. A073898.

Extensions

More terms from Alois P. Heinz, Oct 29 2015