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 A089720 Primes == 1 or 11 (mod 70). 1

%I

%S 11,71,151,211,281,421,431,491,571,631,641,701,911,991,1051,1061,1201,

%T 1471,1481,1621,1831,1901,2111,2251,2311,2381,2521,2531,2591,2671,

%U 2731,2741,2801,3011,3221,3301,3361,3371,3511,3571,3581,3851,3931,4001,4201

%N Primes == 1 or 11 (mod 70).

%C Previous name was: Primes p ending in 1 such that floor(p/7) = 0, 1 or 2 (mod 10).

%H Robert Israel, <a href="/A089720/b089720.txt">Table of n, a(n) for n = 1..10000</a>

%p select(isprime, [seq(seq(70*i+j, j=[1,11]),i=0..1000)]); # _Robert Israel_, Apr 29 2020

%t okQ[n_]:=Mod[n,10]==1&&MemberQ[{0,1,2},Mod[Floor[n/7],10]]; Select[Prime[ Range[600]],okQ] (* _Harvey P. Dale_, Oct 16 2012 *)

%o (PARI) forprime( p=1,9999, p%10==1 & p\7%10<3 & print1(p",")) \\ _M. F. Hasler_, Apr 06 2009

%K nonn

%O 1,1

%A _Roger L. Bagula_, Jan 06 2004

%E Edited by _M. F. Hasler_, Apr 06 2009

%E New name from _Robert Israel_, Apr 29 2020

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Last modified May 28 13:20 EDT 2020. Contains 334683 sequences. (Running on oeis4.)