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A050675
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Numbers n such that concatenation of numbers from 1 to n is a powerful(1) number.
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2
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2, 6, 8, 9, 12, 16, 17, 18, 20, 24, 25, 26, 27, 28, 32, 35, 36, 40, 44, 45, 48, 50, 52, 53, 54, 56, 60, 62, 63, 64
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| M. Fleuren, Smarandache Factors and Reverse Factors, Smarandache Notions Journal, 10 (No. 1-2-3, Spring 1999), 5-38.
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LINKS
| P. De Geest, Normal Smarandache Concatenated Numbers, Prime factors from 1 up to n
M. Fleuren, Factors and primes of Smarandache sequences.
M. Fleuren, Smarandache Factors and Reverse factors
M. L. Perez et al., eds., Smarandache Notions Journal
C. Rivera, Primes by Listing
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EXAMPLE
| a(2)=6 because Sm6 = 123456 = 2.2.2.2.2.2.3.643 = {2^6}.3.643.
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CROSSREFS
| Cf. A007908, A048342, A050687, A050688.
Sequence in context: A043341 A023714 A096507 * A034591 A047278 A172209
Adjacent sequences: A050672 A050673 A050674 * A050676 A050677 A050678
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KEYWORD
| nonn,base,hard
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.
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