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A062859 Size of smallest triangular multiplication table which contains some number n times. 6
1, 4, 12, 18, 30, 40, 60, 72, 90, 120, 140, 168, 180, 210, 252, 280, 315, 336, 360, 420, 504, 560, 630, 672, 720, 792, 840, 924, 990, 1008, 1155, 1232, 1260, 1320, 1386, 1540, 1584, 1680, 1848, 1980, 2016, 2310, 2376, 2520, 2640, 2772, 2970, 3024, 3080 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..49.

EXAMPLE

a(4)=18 because the size-18 triangular multiplication table is the smallest to contain a particular number 4 times (namely the number A062858[4]=36).

CROSSREFS

The least such number is A062858[N].

Cf. A027424, A062851, A062854, A062855, A062856, A062857, A062858, A000217.

Sequence in context: A071929 A008037 A301251 * A300745 A305240 A301106

Adjacent sequences:  A062856 A062857 A062858 * A062860 A062861 A062862

KEYWORD

nonn

AUTHOR

Ron A. Lalonde (ronronronlalonde(AT)hotmail.com), Jun 25 2001

EXTENSIONS

More terms from Don Reble, Nov 08 2001

STATUS

approved

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Last modified August 4 09:03 EDT 2020. Contains 336201 sequences. (Running on oeis4.)