OFFSET
1,2
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
EXAMPLE
a(1) = 1, a(2) = 2+3, a(3) = 3+4+5.
MATHEMATICA
Total[Range[#[[1]], #[[2]]-3]]&/@Module[{nn=80, cm}, cm=Select[ Range[ nn], CompositeQ]; Thread[{Range[Length[cm]], cm}]] (* Harvey P. Dale, Nov 04 2019 *)
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Juri-Stepan Gerasimov, Jun 18 2009
EXTENSIONS
61 replaced by 75, 382 by 402 - R. J. Mathar, Sep 23 2009
STATUS
approved