OFFSET
0,2
COMMENTS
Primes in the sequence include a(1) = 3, a(19) = 282354833, no more through a(100) = 42525387036892760775526906833352845657512183.
The next prime in the sequence is a(1009) which has 438 digits. The one after that is a(3498) which has 1519 digits. [From Harvey P. Dale, Jul 18 2011]
FORMULA
a(n) = SUM[i=0..n] A000149(i). a(n) = SUM[i=0..n] floor(e^i).
MATHEMATICA
Accumulate[Floor[E^Range[0, 4000]]] (* Harvey P. Dale, Jul 18 2011 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, May 02 2006
STATUS
approved