OFFSET
0,1
COMMENTS
Partial sums of iterated triangular numbers with seed a(0)=8. None of the values shown are prime, but there is no a priori obstruction to a prime value.
FORMULA
a(n) = Sum_{i=0..n} A050536(i).
EXAMPLE
a(6) = 8 + 36 + 666 + 222111 + 24666759216 = 24666982037.
MAPLE
A050536 := proc(n) if n = 0 then 8; else binomial( procname(n-1)+1, 2) ; end if; end proc: A174643 := proc(n) add(A050536(i), i=0..n) ; end proc: seq(A174643(n), n=0..10) ; # R. J. Mathar, Apr 15 2010
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Mar 25 2010
EXTENSIONS
One more term from R. J. Mathar, Apr 15 2010
STATUS
approved