OFFSET
1,1
COMMENTS
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
a(n) ~ 6n log n/log log n. - Charles R Greathouse IV, Jan 31 2017
MATHEMATICA
Total /@ Partition[Select[Range[4, 200], 2 == PrimeOmega[#] &], 6, 1]
PROG
(PARI) do(n)=my(v=List([58]), u=List(), t=58); forprime(p=2, n\2, forprime(q=2, min(p, n\p), listput(u, p*q))); u=Set(u); for(i=7, #u, listput(v, t+=u[i]-u[i-6])); Set(v) \\ Charles R Greathouse IV, Jan 31 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Jan 31 2017
STATUS
approved