1,1

The next term is A128646(243)-1, which has 148 decimal digits. New terms should be added to A137689, not here.

(PARI) A137689_v=[3, 4, 5, 7, 8, 9, 10, 11, 15, 16, 23, 24, 26, 47, 48, 54, 78, 79, 80, 243]/*see there*/;

vecsort(vector(#A137689_v, k, denominator(sum(i=1, A137689_v[k], 1/(prime(i)-1)))/*i.e.

A128646(A137689_v[k])*/-1), 0, 8) /* ..., 8 removes duplicate entries in

PARI > 2.4.1 */

Cf. A128646, A137689-A137692, A092063.

Adjacent sequences: A137687 A137688 A137689 this_sequence A137691 A137692 A137693

Sequence in context: A071698 A089188 A086827 this_sequence A107007 A028342 A137982

nonn

M. F. Hasler (Maximilian.Hasler(AT)gmail.com), Feb 07 2008