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A108728
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Number of distinct prime divisors of concatenated even numbers.
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0
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1, 2, 3, 2, 5, 3, 2, 3, 6, 5, 3, 4, 6, 4, 5, 4, 3, 5, 4, 7, 6, 5, 8, 3, 7, 4, 4, 8, 5, 7, 4, 4, 8, 5, 7, 6, 4, 8, 8, 7, 5, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| Number of distinct prime divisors of 2 is 1 - which is the first term.
Number of distinct prime divisors of 24 is 2 - which is the second term.
Number of distinct prime divisors of 246 is 3 - which is the third term.
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CROSSREFS
| Cf. A019520.
Sequence in context: A007967 A054494 A112764 * A049805 A104887 A064886
Adjacent sequences: A108725 A108726 A108727 * A108729 A108730 A108731
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KEYWORD
| nonn,base
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jun 21 2005
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