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%I #19 Jul 08 2020 20:34:56
%S 2894219,60041519,64523969,242024369,407874179,1092040949,1092075389,
%T 1674689729,2281060319,5035134509,5329406669,5683382879,5792424329,
%U 6000216809,6380217479,10409580719,11488703939,13745865209,14181824369,14904963149,15002412599,15412603919
%N Numbers p such that p, 2p+1, 3p+2, 4p+3, 5p+4, 6p+5, 7p+6, 8p+7 are primes.
%C From _Jeppe Stig Nielsen_, Jul 07 2020: (Start)
%C Each term is -1 modulo 210.
%C The subset p, 2p+1, 4p+3, 8p+7 is a Cunningham chain, cf. A023272. (End)
%H Jeppe Stig Nielsen, <a href="/A101769/b101769.txt">Table of n, a(n) for n = 1..50</a>
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Cunningham_chain">Cunningham chain</a>
%t a={}; Do[p=Prime[n]; If[PrimeQ[p*2+1]&&PrimeQ[p*3+2]&&PrimeQ[p*4+3]&&PrimeQ[p*5+4]&&PrimeQ[p*6+5]&&PrimeQ[p*7+6]&&PrimeQ[p*8+7], AppendTo[a, p]], {n, 1, 10^7}]; Print[a]; (* _Vladimir Joseph Stephan Orlovsky_, Apr 29 2008 *)
%Y Cf. A000040, A005384, A023272, A067256, A067257, A067258, A101767, A101768, A101769, A101770, A336060.
%K nonn,easy
%O 1,1
%A _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004
%E a(20)-a(22) from _Jeppe Stig Nielsen_, Jul 07 2020