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.

24, 120, 360, 840, 2520, 7560, 10080, 15120, 27720, 50400, 60480, 83160, 110880, 166320, 332640, 352800, 554400, 665280, 967680, 1081080, 1441440, 2162160, 2822400, 3870720, 3880800, 4324320, 7207200, 8648640, 10644480, 10810800, 17297280, 21621600, 31046400

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.

Links

David A. Corneth and Amiram Eldar, Table of n, a(n) for n = 1..9000 (terms <= 10^45)

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. A000005, A005179, A007416, A072066.

Sequence in context: A372497 A052762 A217056 * A293018 A292969 A292979

Adjacent sequences: A099314 A099315 A099316 * A099318 A099319 A099320

Keyword

nonn

Author

Reinhard Zumkeller, Oct 12 2004

Extensions

More terms from Amiram Eldar, Jul 09 2019

Status

approved