A033176 - OEIS

A033176

Threes and ones.

31, 31331, 313313331, 31331333133331, 31331333133331333331, 313313331333313333313333331, 31331333133331333331333333133333331, 31331333133331333331333333133333331333333331

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OFFSET

1,1

COMMENTS

This sequence contains many primes.

REFERENCES

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

LINKS

Table of n, a(n) for n=1..8.

FORMULA

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

CROSSREFS

Sequence in context: A263585 A176349 A262716 * A263163 A188956 A218142

Adjacent sequences: A033173 A033174 A033175 * A033177 A033178 A033179

KEYWORD

nonn,easy,base,less

AUTHOR

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

EXTENSIONS

More terms from Erich Friedman.

STATUS

approved