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Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PrimeSignature.html">Prime Signature</a>.
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Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PrimeSignature.html">Description of prime signaturePrime Signature</a>
nonn,more
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a(18) > 10^11. [_- _Donovan Johnson_, Oct 24 2009]
a(20) > 10^13. _- _Giovanni Resta_, Jul 13 2015
a(6) = 23 because it begins the first occurrence of 6 consecutive integers that have all different prime signatures ({1}, {1,3}, {2}, {1,1}, {3}, {1,2} respectively for 23 through 28).
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