OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
FORMULA
MATHEMATICA
Module[{nn=60}, Total/@Partition[Riffle[Prime[Range[nn]], {1, -1}, {2, -1, 2}], 2]] (* Harvey P. Dale, Oct 04 2019 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Andrew J. Gacek (andrew(AT)dgi.net)
STATUS
approved