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AR15.COM
9/13/2012 4:51:55 PM EDT
What did I miss This time around?
And what did I get wrong?


1297 - 1299 - 1301 - 1303 - 1307 - 1319 - 1321 - 1327 - 1361 - 1673 - 1373 - 1373 - 1381 - 1399 - 1409 - 1423 - 1427 - 1429 - 1433 - 1439 - 1447 - 1451 - 1453 - 1459 - 1471 - 1481 - 1483 - 1487 - 1489 - 1493 - 1499 - 1511 - 1523 - 1531 - 1543 - 1549 - 1553 - 1559 - 1567 - 1571 - 1579 - 1583 - 1597 - 1601 - 1607 - 1609 - 1613 - 1619 - 1621 - 1627 - 1637 - 1657 - 1663 - 1667 - 1669 - 1693 - 1697 - 1699 - 1709 - 1721 - 1723 - 1733 - 1741 - 1747 - 1753 - 1759 - 1777 - 1783 - 1787 - 1789 - 1801 - 1811 - 1823 - 1831 - 1847 - 1861 - 1867 - 1871 - 1873 - 1877 - 1879 - 1901 1907 - 1913 - 1931 - 1933 - 1949 - 1951 - 1973 - 1979 - 1987 - 1993 - 1997 - 1999- 2003 - 2011 - 2017 - 2027 - 2029 - 2039
9/13/2012 6:30:08 PM EDT
[#1]
1299 is not prime. Easily divided by 3.

A number is divisible by 3  if the sum of the digits is divisible by 3.

http://www.mathgoodies.com/lessons/vol3/divisibility.html
9/21/2012 12:34:44 PM EDT
[#2]
Find a list of primes (there are lots of them out there) and do your own comparison.