login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A248005 Number of primes obtained in the first step of the long division of prime(n) by prime(i), i=2,...,n-1 (see example). 1
1, 1, 1, 2, 3, 2, 3, 3, 3, 5, 4, 4, 5, 4, 5, 4, 4, 5, 7, 7, 4, 7, 7, 5, 6, 6, 7, 9, 7, 8, 9, 7, 8, 8, 9, 10, 5, 7, 8, 11, 9, 13, 10, 10, 7, 9, 8, 12, 11, 12, 10, 12, 12, 12, 10, 10, 14, 12, 11, 12, 13, 10, 12, 10, 13, 15, 13, 11, 12, 12, 15, 17, 12, 13, 13, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,4

LINKS

Peter J. C. Moses, Table of n, a(n) for n = 3..1002

EXAMPLE

Let n=16, prime(16)=53. Consider the first step of the long division of 53 by 3:

   53

  -3

   23

Since 23 is prime, then 3 contributes 1 into a(16); also in the first step of the long division of 53 by 5,17,23 (and only by them) we obtain primes (3,2,7). So a(16)=4.

CROSSREFS

Sequence in context: A272979 A102351 A078173 * A129759 A137467 A261461

Adjacent sequences:  A248002 A248003 A248004 * A248006 A248007 A248008

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Sep 29 2014

EXTENSIONS

More terms from Peter J. C. Moses, Oct 12 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 22 19:56 EST 2019. Contains 320403 sequences. (Running on oeis4.)