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A323426
a(n) = decimal concatenation of n (once), n-1 (twice), n-2 (3 times), ..., 1 (n times).
0
1, 211, 322111, 4332221111, 544333222211111, 655444333322222111111, 7665554444333332222221111111, 877666555544444333333222222211111111
OFFSET
1,2
COMMENTS
a(2), a(3) and a(4) are primes.
CROSSREFS
Cf. A098129.
Sequence in context: A096834 A013547 A181002 * A099687 A358873 A133651
KEYWORD
nonn,easy,base,less
AUTHOR
Eder Vanzei, Aug 30 2019
STATUS
approved