Full Idea
It is clearer that all arithmetical propositions are synthetic if we take larger numbers, for it is then clear that, twist and turn our concepts as we will, without help from intuition we could never find the sum by means of the mere analysis of concepts.
Gist of Idea
With large numbers it is obvious that we could never find the sum by analysing the concepts
Source
Immanuel Kant (Critique of Pure Reason [1781], B016)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.144
A Reaction
I don't see this. Obviously we may not know the name of the number which is the answer. We must analyse 'plus' as well as the component numbers. How can it be synthetic if no experience is involved?