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!)
A076205 Numbers n such that 30*n+{1,7,11,13,17,19,23,29} are all composite. 7
360, 523, 654, 941, 1020, 1047, 1064, 1136, 1188, 1213, 1264, 1280, 1343, 1355, 1445, 1477, 1515, 1526, 1530, 1533, 1582, 1623, 1652, 1693, 1842, 1900, 1960, 2018, 2039, 2129, 2208, 2280, 2309, 2332, 2406, 2413, 2440, 2499, 2539, 2622, 2633, 2650, 2657 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 141.

LINKS

Klaus Brockhaus, Table of n, a(n) for n = 1..6829 (terms < 100000)

PROG

(PARI) {cav(mx)= local(wp=[1, 7, 11, 13, 17, 19, 23, 29], v=[], i, j, m); for(k=1, mx, i=k*30; j=1; m=1; while(m&&(j<9), m=!isprime(i+wp[j]); j+=1); if(m, v=concat(v, k))); return(v)}

(MAGMA) [ n: n in [0..3000] | forall{ q: q in [1, 7, 11, 13, 17, 19, 23, 29] | not IsPrime(30*n+q) } ]; // Klaus Brockhaus, Feb 24 2011

CROSSREFS

Cf. A005776, A007775, A100418-A100423.

Sequence in context: A072414 A163569 A063067 * A048978 A056502 A056492

Adjacent sequences:  A076202 A076203 A076204 * A076206 A076207 A076208

KEYWORD

easy,nonn

AUTHOR

Donald S. McDonald, Nov 02 2002

EXTENSIONS

More terms from Ferenc Adorjan (fadorjan(AT)freemail.hu), Nov 19 2004

Edited by Don Reble, Nov 17 2005

Edited by N. J. A. Sloane, Sep 14 2008 at the suggestion of R. J. Mathar

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 January 24 04:35 EST 2020. Contains 331183 sequences. (Running on oeis4.)