OFFSET
1,3
COMMENTS
Conjecture: For n > 4 the last term of the n-th group is 2p where p is the largest prime in the (n-1)th group. And these are the Bertrand primes.
FORMULA
MATHEMATICA
a = {{1, 1}}; Do[k = Last@ a[[i - 1]]; While[! Divisible[Pochhammer[Total@ a[[i - 1]], k], Pochhammer @@ a[[i - 1]]], k++]; AppendTo[a, {Total@a[[i - 1]], k}], {i, 2, 17}]; Last /@ a (* Michael De Vlieger, Dec 15 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Dec 13 2003
EXTENSIONS
More terms from Mohammed Bouayoun (bouyao(AT)wanadoo.fr), Mar 05 2004
More terms from David Wasserman, Feb 10 2006
STATUS
approved