OFFSET
1,1
COMMENTS
The computations were done without any assumptions on the form of d. 181st term is greater than 10^12.
LINKS
Sameen Ahmed Khan, Table of n, a(n) for n = 1..180
Sameen Ahmed Khan, Primes in Geometric-Arithmetic Progression, arXiv:1203.2083 [math.NT], 2012. - From N. J. A. Sloane, Sep 15 2012
EXAMPLE
d = 301125300 then {11, 301125311, 602250611, 903375911, 1204501211, 1505626511, 1806751811, 2107877111, 2409002411, 2710127711} which is 10 primes in arithmetic progression.
MATHEMATICA
a = 11; 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, a + 9*d}] == {True, True, True, True, True, True, True, True, True, True}, Print[d]], {d, 600000000, 2}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Sameen Ahmed Khan, Feb 03 2012
EXTENSIONS
Typo in Name fixed by Zak Seidov, Jan 12 2014
STATUS
approved