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A104377
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Number of distinct prime divisors of numbers derived from three consecutive concatenated odd numbers.
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1
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2, 3, 2, 2, 3, 4, 2, 3, 3, 2, 4, 2, 2, 2, 2, 4, 3, 3, 2, 2, 4, 3, 3, 3, 2, 5, 3, 2, 3, 3, 3, 3, 2, 2, 2, 3, 2, 3, 3, 3, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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EXAMPLE
| The number of distinct prime divisors of 135 is 2 - the first term in the sequence.
The number of distinct prime divisors of 357 is 3 - the second term in the sequence.
The number of distinct prime divisors of 579 is 2 - the third term in the sequence.
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MAPLE
| read("transforms") :
A104377 := proc(n) digcat2(digcat2(2*n+1, 2*n+3), 2*n+5) ; nops(numtheory[factorset](%)) ; end proc: # R. J. Mathar, Feb 03 2011
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CROSSREFS
| Sequence in context: A076733 A079643 A118480 * A109337 A137266 A062948
Adjacent sequences: A104374 A104375 A104376 * A104378 A104379 A104380
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KEYWORD
| nonn,base
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 16 2005
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