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A048198 Number of primes between successive n's, where n mod 10 = 5. +0
3
2, 3, 3, 2, 3, 2, 2, 3, 2, 1, 3, 3, 0, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 3, 2, 1, 2, 2, 3, 1, 0, 3, 1, 1, 1, 3, 1, 2, 2, 1, 2, 1, 2, 2, 2, 1, 3, 1, 1, 2, 2, 1, 2, 0, 1, 1, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 1, 1, 2, 2, 1, 2, 2, 0, 1, 1, 2, 2, 2, 1, 1, 3, 0, 3, 1, 0, 2, 1, 1, 2, 2, 0, 2, 2, 1, 1, 2, 2, 2, 1 (list; graph; listen)
OFFSET

0,1

COMMENT

A way to visualize the distribution of primes without the clutter of the numbers themselves. Consecutive 0's indicate stretches where there are no primes. Other patterns become obvious, as a string of 2's or 1's.

FORMULA

Starting at 0, count primes between 0-5, 5-15, 15-25, etc.

EXAMPLE

Between n's 115 and 125 there are no primes, indicated by the entry 0.

CROSSREFS

Cf. A048199.

Sequence in context: A030423 A130631 A130633 this_sequence A096006 A131294 A102313

Adjacent sequences: A048195 A048196 A048197 this_sequence A048199 A048200 A048201

KEYWORD

easy,nonn

AUTHOR

Enoch Haga (Enokh(AT)comcast.net)

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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.


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