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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A090680 Number of primes p such that n < p < n+A033677(n). 0
1, 1, 1, 1, 1, 2, 1, 1, 2, 3, 1, 3, 2, 2, 2, 4, 2, 4, 1, 1, 3, 5, 1, 1, 3, 2, 2, 6, 1, 7, 1, 3, 4, 2, 2, 9, 4, 3, 3, 9, 2, 9, 2, 2, 5, 9, 1, 1, 2, 4, 3, 11, 2, 2, 2, 5, 7, 13, 2, 12, 6, 2, 2, 3, 1, 13, 4, 5, 3, 14, 2, 13, 8, 3, 3, 2, 3, 15, 2, 2, 8, 15, 1, 3, 8, 7, 2, 16, 1, 3, 6, 6, 10, 6, 4, 19, 4, 4, 4, 20, 4, 19, 3, 3, 10, 19, 2, 18, 1, 5, 1, 18, 2, 3, 4, 1, 10, 2, 2, 2, 12, 8, 6, 5, 4, 23, 3, 8, 3, 23, 2, 4, 14 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,6

COMMENTS

Conjecture: no a(n) is zero. Example: n=15: A033677(15) = 5; 2 primes between 15 and 15+5=20 (17 and 19), so a(15) = 2.

LINKS

Table of n, a(n) for n=2..134.

CROSSREFS

Cf. A033677.

Sequence in context: A037039 A182972 A153452 * A133771 A288158 A319522

Adjacent sequences:  A090677 A090678 A090679 * A090681 A090682 A090683

KEYWORD

easy,nonn

AUTHOR

Philippe Deléham, Dec 18 2003

EXTENSIONS

More terms from Benoit Cloitre, Dec 23 2003

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 October 17 11:59 EDT 2019. Contains 328110 sequences. (Running on oeis4.)