OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..530
EXAMPLE
311 = 101 + 103 + 107 = 53 + 59 + 61 + 67 + 71 = 31 + 37 + 41 + 43 + 47 + 53 + 59.
MATHEMATICA
pr = Prime[Range[100000]]; to3 = Total /@ Partition[pr, 3, 1];
to5 = Total /@ Partition[pr, 5, 1]; to7 = Total /@ Partition[pr, 7, 1];
Select[Intersection[to3, to5, to7], PrimeQ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Mar 04 2013
STATUS
approved