OFFSET
1,1
COMMENTS
Elements in this sequence can themselves be 7-almost primes. a(1) = 128 = 2^7. Also a 7-Brilliant number. a(2) = 320 = 2^6 * 5. Also a 7-Brilliant number. Does this happen infinitely often? - Jonathan Vos Post, Dec 11 2004
EXAMPLE
a(2)=320 because sum of first two 7-almost primes i.e. 128+192 is 320.
MATHEMATICA
Accumulate[Select[Range[2500], PrimeOmega[#]==7&]] (* Harvey P. Dale, Oct 18 2018 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Shyam Sunder Gupta, Aug 24 2003
STATUS
approved