|
%I #8 Nov 26 2017 05:29:08
%S 15855,31785,267300,280665,399675,561330,946050,990510,1022220,
%T 1082115,1164735,1283250,1303875,1309545,1514880,1669065,1924410,
%U 2850225,3078675,3092760,3492270,3536385,3611205,3920670,4148970,4454775
%N Numbers n such that 4n-1, 8n-1, 16n-1, 32n-1, 64n-1 and 128n-1 are primes.
%H Iain Fox, <a href="/A101320/b101320.txt">Table of n, a(n) for n = 1..1000</a>
%e 4*15855-1, 8*15855-1, 16*15855-1, 32*15855-1, 64*15855-1 and 128*15855-1 are primes, so 15855 is a term.
%o (PARI) lista(nn) = for(n=15855, nn, if(ispseudoprime(4*n-1) && ispseudoprime(8*n-1) && ispseudoprime(16*n-1) && ispseudoprime(32*n-1) && ispseudoprime(64*n-1) && ispseudoprime(128*n-1), print1(n, ", "))) \\ _Iain Fox_, Nov 23 2017
%Y Cf. A002515, A101790, A101794, A101994.
%K easy,nonn
%O 1,1
%A Douglas Stones (dssto1(AT)student.monash.edu.au), Dec 23 2004
|
