A088608 a(1) = 1, a(n) = prime(n) if n is composite else a(n) = composite(n).

1, 6, 8, 7, 10, 13, 14, 19, 23, 29, 20, 37, 22, 43, 47, 53, 27, 61, 30, 71, 73, 79, 35, 89, 97, 101, 103, 107, 44, 113, 46, 131, 137, 139, 149, 151, 54, 163, 167, 173, 58, 181, 62, 193, 197, 199, 66, 223, 227, 229, 233, 239, 75, 251, 257, 263, 269, 271, 82, 281, 85, 293

Offset

1,2

Links

Table of n, a(n) for n=1..62.

Example

a(9) = 23 = prime(9).

Mathematica

Join[{1}, Module[{nn=100, cmps}, cmps=Select[Range[2nn], CompositeQ]; Table[ If[ PrimeQ[n], cmps[[n]], Prime[n]], {n, 2, nn}]]] (* Harvey P. Dale, May 22 2021 *)

Crossrefs

Cf. A088607.

Sequence in context: A157852 A327839 A365125 * A323984 A176104 A011481

Adjacent sequences: A088605 A088606 A088607 * A088609 A088610 A088611

Keyword

base,nonn

Author

Amarnath Murthy, Oct 16 2003

Extensions

More terms from Ray Chandler, Oct 18 2003

Status

approved