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A188430 U(n) is the maximum of the largest elements of all n-full sets, or 0 if no such set exists. 3
1, 0, 2, 0, 0, 3, 4, 0, 0, 4, 5, 6, 7, 7, 8, 6, 7, 8, 9, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31, 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Let A be a set of positive integers. We say that A is n-full if (sum A)=[n] for a positive integer n, where (sum A) is the set of all positive integers which are a sum of distinct elements of A and [n]={1,2,...,n}. The number U(n) denotes the maximum of the set {max A: (sum A)=[n]}, or 0 if there is no n-full set.

LINKS

Table of n, a(n) for n=1..76.

L. Naranjani and M. Mirzavaziri, Full Subsets of N, Journal of Integer Sequences, 14 (2011), Article 11.5.3.

FORMULA

U(n) is the ceiling of n/2 for n>=20.

PROG

(Haskell)

a188430 n = a188430_list !! (n-1)

a188430_list = [1, 0, 2, 0, 0, 3, 4, 0, 0, 4, 5, 6, 7, 7, 8, 6, 7, 8, 9] ++

               (drop 19 a008619_list)

-- Reinhard Zumkeller, Aug 06 2015

CROSSREFS

Cf. A188429, A188431.

Cf. A008619.

Sequence in context: A174956 A124182 A188429 * A013585 A261319 A230414

Adjacent sequences:  A188427 A188428 A188429 * A188431 A188432 A188433

KEYWORD

nonn

AUTHOR

Madjid Mirzavaziri, Mar 31 2011

STATUS

approved

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Last modified December 13 03:41 EST 2019. Contains 329968 sequences. (Running on oeis4.)