A255646 - OEIS

%I #10 Aug 30 2017 02:47:36

%S 7,5,3,5,9,5,7,5,7,3,5,1,5,5,7,1,5,5,1,3,5,9,5,5,3,3,5,7,3,9,5,7,9,3,

%T 5,9,5,5,5,5,7,3,7,1,9,9,5,1,5,5,3,5,9,5,7,7,9,5,1,7,3,5,5,1,5,5,1,7,

%U 9,5,7,5,1,5,3,5,7,1,7,3,5,7,3,9,5,5

%N Odd triprimes modulo 10.

%C Final digits of odd triprimes;

%C a(n) = A046316(n) mod 10.

%H Reinhard Zumkeller, <a href="/A255646/b255646.txt">Table of n, a(n) for n = 1..10000</a>

%H <a href="/index/Fi#final">Index entries for sequences related to final digits of numbers</a>

%o (Haskell)

%o a255646 = flip mod 10 . a046316

%o (PARI) do(x)=my(v=List(), t); forprime(p=3, x\9, forprime(q=3, min(x\(3*p), p), t=p*q; forprime(r=3, min(x\t, q), listput(v, t*r)))); Set(v)%10 \\

%Y Cf. A046316, subsequence of A253721.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, May 05 2015