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A099317 Minimal numbers having in canonical prime factorization at least one factor p^e such that e+1 is not prime, p prime and e>0. 1
24, 120, 360, 840, 2520, 7560, 10080, 15120, 27720, 50400, 60480, 83160, 110880, 166320, 332640, 352800, 554400 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

A minimal number is the smallest number with a given number of divisors, see A007416;

A000005(a(n)) = A072066(m) for some m.

EXAMPLE

A007416(38) = A005179(64) = 7560 = 2^3*3^3*5*7;

A007416(39) = A005179(72) = 10080 = 2^5*3^2*5*7.

CROSSREFS

Cf. A005179.

Sequence in context: A069074 A059775 A052762 * A052760 A179720 A052754

Adjacent sequences:  A099314 A099315 A099316 * A099318 A099319 A099320

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 12 2004

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Last modified February 14 13:08 EST 2012. Contains 205623 sequences.