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A270306 Smallest number which is representable as a sum of n but no fewer consecutive nonnegative integers, or 0 for n > 1 if no such number. 1
0, 1, 6, 10, 20, 0, 28, 44, 0, 0, 88, 0, 104, 0, 0, 136, 272, 0, 304, 0, 0, 0, 368, 0, 0, 0, 0, 0, 464, 0, 496, 592, 0, 0, 0, 0, 1184, 0, 0, 0, 1312, 0, 1376, 0, 0, 0, 1504, 0, 0, 0, 0, 0, 1696, 0, 0, 0, 0, 0, 1888, 0, 1952, 0, 0, 2144, 0, 0, 4288, 0, 0, 0, 4544 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Ray Chandler, Table of n, a(n) for n = 1..10000

FORMULA

a(A111774(n)) = 0.

a(A174090(n)) = A163172(n).

EXAMPLE

a(2) = 1 = 0 + 1 (two but no fewer terms)

a(3) = 6 = 1 + 2 + 3 (three but no fewer terms)

a(4) = 10 = 1 + 2 + 3 + 4 (four but no fewer terms)

a(5) = 20 = 2 + 3 + 4 + 5 + 6 (five but no fewer terms)

a(6) = 0, since no number needs six but no fewer terms

a(7) = 28 = 1 + 2 + 3 + 4 + 5 + 6 + 7 (seven but no fewer terms)

CROSSREFS

Cf. A138591, A163172, A270296 to A270303.

Sequence in context: A109312 A257858 A095985 * A145351 A227874 A015783

Adjacent sequences:  A270303 A270304 A270305 * A270307 A270308 A270309

KEYWORD

nonn

AUTHOR

Martin Renner, Mar 14 2016

STATUS

approved

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Last modified August 26 03:38 EDT 2019. Contains 326324 sequences. (Running on oeis4.)