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<p>[QUOTE=&quot;messydesk, post: 24561430, member: 1765&quot;]I can&#039;t remember when I started it, and I wouldn&#039;t be surprised if it was 8-10 years ago.&nbsp; I &quot;only&quot; need 8 coins to fill in a solid run from 1481 to present.&nbsp; If that takes me until 2027, I&#039;ll need 9 coins.&nbsp; The set will contain two &quot;prime decades,&quot; which is a sequence of 4 prime numbers n+1, n+3, n+7, n+9.&nbsp; The later prime decade is the 1870s, which has all US coins.&nbsp; The earlier one is the 1480s, for which attractive, dated coins are not so easy to find.[/QUOTE]</p><p><br /></p>

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