A255646 Odd triprimes modulo 10.

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, 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, 9, 5, 7, 5, 1, 5, 3, 5, 7, 1, 7, 3, 5, 7, 3, 9, 5, 5

Offset: 1

Author

Reinhard Zumkeller, May 05 2015

Keywords

• nonn

Comments

Final digits of odd triprimes;

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

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
• Index entries for sequences related to final digits of numbers

Crossrefs

Cf. A046316, subsequence of A253721.

Programs

Haskell

a255646 = flip mod 10 . a046316

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 \\