OFFSET
1,2
COMMENTS
A141468(n)=n-th nonprime.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
Nonprime (7)=10 is additive nonprime because 1+0=1 (odd) is nonprime (2).
Nonprime (12)=18 is additive nonprime because 1+8=9 (odd) is nonprime (6), etc.
MATHEMATICA
osdnpQ[n_]:=Module[{s=Total[IntegerDigits[n]]}, OddQ[s]&&!PrimeQ[s]]; Select[Range[400], osdnpQ] (* Harvey P. Dale, Aug 04 2013 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Juri-Stepan Gerasimov, Sep 03 2008
EXTENSIONS
45 and 207 inserted and extended by R. J. Mathar, Sep 05 2008
STATUS
approved