A143789 Lightest finite monotonically increasing sequence obtained by chunking an 18-digit Skolem-Langford integer (see A108116). There are d digits between two d's in the sequence.

4, 5, 6, 7, 8, 41, 51, 63, 72, 83, 200

Offset

1,1

Comments

"Lightest" --> the weight of such a sequence is the sum of all its terms; "Finite" --> by definition all such sequences are finite; "Monotonically" --> no two adjacent terms in the sequence are the same; "Increasing" --> a(n) < a(n+1); "Chunking" --> cutting in slices. The original Skolem-Langford number is 456784151637283200 [this is a(14565) in "D. Wilson, Complete table of n, a(n) for n = 1..20120", which can be found at A108116] and this integer, properly chunked, produces the sequence]. In the sequence there is no digit between the two 0's, there is one digit between the two 1's, there are two digits between the two 2's,... there are eight digits between the two 8's. This sequence has been computed by Dan Hoey.

Links

Table of n, a(n) for n=1..11.

Crossrefs

Cf. A108116 and A132291

Sequence in context: A140293 A075341 A309358 * A068521 A196697 A068318

Adjacent sequences: A143786 A143787 A143788 * A143790 A143791 A143792

Keyword

base,easy,fini,nonn

Author

Dan Hoey and Eric Angelini, Sep 01 2008

Status

approved