1,2

For n = 4 there are 5 possibilities: 1/2/3/5/7 1/2*3/5*7 1/2*3*5/7 1/2*3*5*7 1*2/3*5*7

Table of n, a(n) for n=1..33.

Sequence in context: A123124 A166236 A291768 * A086370 A083788 A058317

Adjacent sequences: A059580 A059581 A059582 * A059584 A059585 A059586

nonn

Naohiro Nomoto, Feb 17 2001

More terms from Sascha Kurz, Oct 16 2001

approved