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Search: id:A046461
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| A046461 |
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Numbers n such that concatenation of numbers from 1 to n has exactly 2 prime factors, counted with multiplicity. |
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+0
4
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OFFSET
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1,1
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REFERENCES
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M. Fleuren, Smarandache Factors and Reverse Factors, Smarandache Notions Journal, 10 (No. 1-2-3, Spring 1999), 5-38.
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LINKS
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P. De Geest, Normal Smarandache Concatenated Numbers, Prime factors from 1 up to n
M. L. Perez et al., eds., Smarandache Notions Journal
C. Rivera, Primes by Listing
M. Fleuren, Factors and primes of Smarandache sequences.
M. Fleuren, Smarandache Factors and Reverse factors
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CROSSREFS
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Cf. A046460.
Sequence in context: A113874 A042773 A042173 this_sequence A084590 A041135 A041379
Adjacent sequences: A046458 A046459 A046460 this_sequence A046462 A046463 A046464
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KEYWORD
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nonn,hard,base,more
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1998.
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