0,3

The even prime 2 is not split.

Table of n, a(n) for n=0..75.

The prime 29 is split into 14 and 15.

f[n_] := If[ !PrimeQ@ n || n == 2, n, {(n - 1)/2, (n + 1)/2}]; Array[ f, 60, 0] // Flatten (* Robert G. Wilson v, Aug 15 2010 *)

Cf. A000040, A002808.

Sequence in context: A099470 A099254 A186731 * A300417 A121339 A307236

Adjacent sequences: A180105 A180106 A180107 * A180109 A180110 A180111

base,nonn

Parthasarathy Nambi, Aug 10 2010

More terms from Robert G. Wilson v, Aug 15 2010

approved