login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A100421 Numbers n such that 30*n+{1,7,11,13,19,23,29} are all prime. 1

%I #16 Sep 06 2023 11:49:06

%S 2,79,391701,505017,740413,787187,933025,1169863,1333719,1406792,

%T 2212261,2719950,2962738,3125992,3284955,3384586,3727271,3821295,

%U 3861881,4320864,4439878,4764356,5014865,5480190,5879274,6124442

%N Numbers n such that 30*n+{1,7,11,13,19,23,29} are all prime.

%C Values are 2 mod 7.

%C In each case, the 7 primes are necessarily consecutive. See the comment in A100418. - _Peter Munn_, Sep 06 2023

%t Select[Range[7*10^6],AllTrue[30#+{1,7,11,13,19,23,29},PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, May 16 2016 *)

%o (Magma) [ n: n in [2..70000000 by 7] | forall{ q: q in [1, 7, 11, 13, 19, 23, 29] | IsPrime(30*n+q) } ]; // _Klaus Brockhaus_, Feb 24 2011

%Y Cf. A005776, A007775, A076205, A100418-A100420, A100422, A100423.

%K easy,nonn

%O 1,1

%A Ferenc Adorjan (fadorjan(AT)freemail.hu), Nov 19 2004

%E Edited by _Don Reble_, Nov 17 2005

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 12 14:10 EDT 2024. Contains 372480 sequences. (Running on oeis4.)