A060301 - OEIS

A060301

For n>3: a(n) is a multiple of three distinct earlier terms.

2, 3, 5, 30, 180, 300, 450, 1080, 1800, 2700, 3000, 4500, 6480, 6750, 10800, 16200, 18000, 27000, 30000, 38880, 40500, 45000, 64800, 67500, 97200, 101250, 108000, 162000, 180000, 233280, 243000, 270000, 300000, 388800, 405000, 450000, 583200

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..37.

R. G. Wilson, V, Note, n.d.

FORMULA

a(n) is of the form 2^b*3^c*5^d where either b+c+d=1, or where each of b, c and d are positive and the largest of the three is an odd number less than the sum of the other two. For n>3: a(n) is 30 times a power of 6 times a power of 10 times a power of 15.

EXAMPLE

a(15) = 10800 = 2*30*180 = a(1)*a(4)*a(5).

CROSSREFS

Cf. A000423.

Sequence in context: A110389 A083388 A090475 * A040119 A186635 A265807

Adjacent sequences: A060298 A060299 A060300 * A060302 A060303 A060304

KEYWORD

nonn

AUTHOR

Henry Bottomley, Mar 28 2001

STATUS

approved