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A061218 Least number such that number of divisors is n-th term from A014613 (numbers of form pqrs, products of exactly 4 primes, counted with multiplicity). 0
120, 360, 1260, 1680, 6300, 6720, 5040, 44100, 20160, 107520, 25200, 45360, 430080, 100800, 322560, 176400, 6881280, 181440, 226800, 1290240, 440401920, 705600, 1632960, 1612800, 20643840, 100800, 907200 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=A005179[A014613(n)]

EXAMPLE

pqrs=210 is the 27th term in A014613; the smallest number with 210 divisors is 907200=2.2.2.2.2.2.3.3.3.3.5.5.7

CROSSREFS

Cf. A000005, A005179, A014613, A061148, A061149, A061299.

Sequence in context: A118058 A144524 A052768 * A052778 A147983 A167562

Adjacent sequences:  A061215 A061216 A061217 * A061219 A061220 A061221

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Jun 06 2001

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Last modified February 17 08:44 EST 2012. Contains 205998 sequences.