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A255646
Odd triprimes modulo 10.
3
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
1,1
COMMENTS
Final digits of odd triprimes;
a(n) = A046316(n) mod 10.
PROG
(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 \\
CROSSREFS
Cf. A046316, subsequence of A253721.
Sequence in context: A176974 A198983 A019935 * A255196 A345736 A206643
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, May 05 2015
STATUS
approved