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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A283053 Numbers n such that A068902(n+1) <= A068902(n). 1
69, 181, 1052, 6457, 6460, 6466, 40083, 100362, 251707, 251722, 251736, 251741, 637236, 637322, 637326, 637333, 4124458, 4124467, 4124587, 10553439, 10553444, 10553454, 10553478, 10553502, 10553505, 10553547, 10553568, 10553573, 10553575, 10553818, 10553827 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n for which n*floor(ceiling(prime(n+1)/(n+1))*(1+1/n)) < prime(n).

LINKS

Table of n, a(n) for n=1..31.

EXAMPLE

For n=1, A068902(69) = 414 <= A068902(70) = 350.

MATHEMATICA

Flatten@ Position[Differences@ Table[n Ceiling[Prime@ n/n], {n, 10^7}], k_ /; k <= 0] (* Michael De Vlieger, Feb 27 2017 *)

PROG

(MATLAB)

P = primes(10^8);

N = numel(P);

R = [1:N] .* ceil(P ./ [1:N]);

Rd = R(2:end) - R(1:end-1);

find(Rd <= 0)

CROSSREFS

Cf. A068902.

Sequence in context: A259637 A211688 A153672 * A249899 A009434 A228671

Adjacent sequences:  A283050 A283051 A283052 * A283054 A283055 A283056

KEYWORD

nonn

AUTHOR

Robert Israel, Feb 27 2017

EXTENSIONS

More terms from Michael De Vlieger, Feb 27 2017

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 May 21 08:48 EDT 2019. Contains 323441 sequences. (Running on oeis4.)