1,1

Table of n, a(n) for n=1..10.

The solutions [a,b,c] of 1/a + 1/b + 1/c = 1/2 and a <= b <= c, listed in lexicographical order, are: {[3, 7, 42], [3, 8, 24], [3, 9, 18], [3, 10, 15], [3, 12, 12], [4, 5, 20], [4, 6, 12], [4, 8, 8], [5, 5, 10], [6, 6, 6]}.

(PARI) forvec(v=vector(3, i, [3, 42]), sum(j=1, 3, 1/v[j])==1/2 && print1(v[1]", "), 1)

Cf. A236681, A236683, A236684.

Sequence in context: A050499 A304431 A147752 * A114227 A187469 A112593

Adjacent sequences: A236679 A236680 A236681 * A236683 A236684 A236685

nonn,fini,full

M. F. Hasler, Jan 29 2014

approved