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A160401 Table read by antidiagonals: a(m,n) = the smallest composite multiple of both m and n. 0
4, 4, 4, 6, 4, 6, 4, 6, 6, 4, 10, 4, 6, 4, 10, 6, 10, 12, 12, 10, 6, 14, 6, 15, 4, 15, 6, 14, 8, 14, 6, 20, 20, 6, 14, 8, 9, 8, 21, 12, 10, 12, 21, 8, 9, 10, 18, 24, 28, 30, 30, 28, 24, 18, 10, 22, 10, 9, 8, 35, 6, 35, 8, 9, 10, 22, 12, 22, 30, 36, 40, 42, 42, 40, 36, 30, 22, 12, 26, 12, 33 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(p,1) = a(1,p) = a(p,p) = 2p, where p = any one prime. a(1,1) = 4. Otherwise, a(m,n) = LCM(m,n).

LINKS

Table of n, a(n) for n=1..81.

CROSSREFS

Cf. A003990.

Sequence in context: A130331 A141241 A140696 * A114742 A098013 A116446

Adjacent sequences:  A160398 A160399 A160400 * A160402 A160403 A160404

KEYWORD

nonn,tabl

AUTHOR

Leroy Quet, May 12 2009

EXTENSIONS

Extended by Ray Chandler, Jun 18 2009

STATUS

approved

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Last modified December 18 18:49 EST 2014. Contains 252174 sequences.