The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation. Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A206043 Values of the difference d for 9 primes in arithmetic progression with the minimal start sequence {11 + j*d}, j = 0 to 8. 8
 32671170, 54130440, 59806740, 145727400, 224494620, 246632190, 280723800, 301125300, 356845020, 440379870, 486229380, 601904940, 676987920, 777534660, 785544480, 789052530, 799786890, 943698210, 1535452800, 1536160080, 1760583300, 1808008020 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The computations were done without any assumptions on the form of d. LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..1419 S. A. Khan, Primes in Geometric-Arithmetic Progression, arXiv preprint arXiv:1203.2083, 2012. - From N. J. A. Sloane, Sep 15 2012 EXAMPLE d = 54130440 then {11, 54130451, 108260891, 162391331, 216521771, 270652211, 324782651, 378913091, 433043531} which is 9 primes in arithmetic progression. MATHEMATICA a = 11; t = {}; Do[If[PrimeQ[{a, a + d, a + 2*d, a + 3*d, a + 4*d, a + 5*d, a + 6*d, a + 7*d, a + 8*d}] == {True, True, True, True, True, True, True, True, True}, AppendTo[t, d]], {d, 10^9}]; t PROG (PARI) forstep(k=210, 1e10, 210, forstep(p=k+11, 8*k+11, k, if(!isprime(p), next(2))); print1(k", ")) \\ Charles R Greathouse IV, Feb 09 2012 CROSSREFS Cf. A040976, A206037, A206038, A206039, A206040, A206041, A206042, A206044, A206045. Sequence in context: A153752 A209912 A290264 * A157080 A157081 A015354 Adjacent sequences:  A206040 A206041 A206042 * A206044 A206045 A206046 KEYWORD nonn AUTHOR Sameen Ahmed Khan, Feb 03 2012 EXTENSIONS a(20) corrected by Charles R Greathouse IV, Feb 09 2012 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.

Last modified July 10 00:25 EDT 2020. Contains 335570 sequences. (Running on oeis4.)