Children in Need Quiz

[jared25]

Would be grateful for any help with the following

What Comes Next

13) 1, 2, 4, 6, 10, 12, 16, 18, 22, ?
16) 1, 18, 4, 13, 6, 10, 15, 2, ?
18) M-5, LA-5, S-5, B-5, A-1, S-11, A-9, ?
23) Ac, Al, Am, Sb, Ar, As, At, ? (can find a list without the Sb in it that says Au follows, but can find nothing with the Sb in it)

[jared25]

Have just managed to work out No. 16

[smouse]

18 look at Olympics
23 look what sb stands for then look at rest and write them down
13 prime numbers minus 1 (found exact question on a site)

[jared25]

Thanks smouse will give your clues some serious thought