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A033176 Threes and ones. 0

%I

%S 31,31331,313313331,31331333133331,31331333133331333331,

%T 313313331333313333313333331,31331333133331333331333333133333331,

%U 31331333133331333331333333133333331333333331

%N Threes and ones.

%C This sequence contains many primes.

%D F. Smarandache, Properties of numbers, University of Craiova, 1973

%F a(n) has increasing groups of 31, 331, ..., 33...31 (n times 3) concatenated.

%K nonn,easy,base,less

%O 1,1

%A Jan Jensen (dorul(AT)post6.tele.dk)

%E More terms from _Erich Friedman_.

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Last modified July 29 12:38 EDT 2021. Contains 346346 sequences. (Running on oeis4.)