A137868 LCM of two smallest numbers with n divisors.

6, 36, 24, 1296, 36, 46656, 120, 900, 240, 60466176, 360, 2176782336, 960, 1296, 840, 2821109907456, 1260, 101559956668416, 1680, 14400, 15360, 131621703842267136, 2520, 810000, 61440, 44100, 6720, 6140942214464815497216, 5040

Offset

2,1

Comments

a(1) is undefined because only one number (1) has 1 divisor.

Links

Table of n, a(n) for n=2..30.

Example

a(4) = 24 because the two smallest numbers with 4 divisors are 6 and 8 and the LCM of 6 and 8 is 24.

Prog

(PARI) A137868(i, l) = { for(n=1, i, one=0; two=0; for(j=2, l, if (numdiv(j)==n && one!=0, two=j; result=lcm(one, two); print1("n="n" one="one" two="two " result="result" "); break); if (numdiv(j) == n && one==0, one=j); ); ); } - Alexander R. Povolotsky, May 01 2008

Crossrefs

Sequence in context: A036125 A001311 A360442 * A070401 A330681 A070400

Adjacent sequences: A137865 A137866 A137867 * A137869 A137870 A137871

Keyword

nonn

Author

J. Lowell, Apr 29 2008

Extensions

More terms from R. J. Mathar, May 03 2008

Status

approved