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A105080 Number of distinct prime divisors of 10000^n - 3. 1
2, 2, 2, 4, 4, 2, 3, 4, 4, 5, 4, 5, 4, 4, 4, 4, 5, 3, 5, 4, 5, 3, 4, 8, 4, 3, 6, 5, 5, 3, 7, 5, 3, 5, 1, 4, 6, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..38.

Makoto Kamada, Factorizations of 99...997.

FORMULA

A105080(n) = A105068(4n) = A105069(2n). - Robert G. Wilson v, Apr 08 2005

EXAMPLE

The number of distinct prime divisors of 10000^1 - 3 is 2, so the first term is 2.

CROSSREFS

Cf. A089675, A105068, A105069.

Sequence in context: A179651 A139560 A192095 * A336299 A206424 A117728

Adjacent sequences:  A105077 A105078 A105079 * A105081 A105082 A105083

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Apr 06 2005

EXTENSIONS

More terms from Robert G. Wilson v, Apr 08 2005

STATUS

approved

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Last modified February 25 08:33 EST 2021. Contains 341606 sequences. (Running on oeis4.)