login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A242515 Numbers n such that 12n+1, 12n+5, 12n+7, 12n+11 are all composite numbers. 1
44, 70, 72, 74, 105, 111, 112, 132, 137, 140, 147, 154, 163, 170, 182, 193, 202, 207, 209, 235, 245, 248, 252, 258, 262, 273, 285, 312, 315, 317, 322, 329, 331, 336, 345, 347, 349, 359, 369, 372, 377, 384, 392, 397, 403, 404, 422, 427, 437 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..2000

EXAMPLE

a(1) = 44; 44*12+1=529, 44*12+5=533, 44*12+7=535, 44*12+11=539, and 529, 533, 535 and 539 are all composites.

MATHEMATICA

Select[Range[500], AllTrue[12#+{1, 5, 7, 11}, CompositeQ]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 13 2018 *)

PROG

(PARI)

for(i=0, 1000, if(!isprime(12*i+1) && !isprime(12*i+5) && !isprime(12*i+7) && !isprime(12*i+11), print1(i", "))) \\ Lear Young, May 16 2014

CROSSREFS

Subsequence of A153383.

Sequence in context: A111494 A092025 A250329 * A156812 A171665 A049103

Adjacent sequences:  A242512 A242513 A242514 * A242516 A242517 A242518

KEYWORD

nonn

AUTHOR

Lear Young, May 16 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 May 16 04:53 EDT 2021. Contains 343937 sequences. (Running on oeis4.)