A072397 Smallest Fibonacci number with n prime factors when counted with multiplicity.

2, 21, 8, 6765, 2584, 144, 832040, 86267571272, 46368, 14930352, 30960598847965113057878492344, 4807526976, 160500643816367088, 498454011879264, 16641027750620563662096, 51680708854858323072, 34507973060837282187130139035400899082304280

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Hisanori Mishima, Fibonacci numbers (n = 1 to 100).

Hisanori Mishima, Fibonacci numbers (n = 101 to 200).

Hisanori Mishima, Fibonacci numbers (n = 201 to 300).

Hisanori Mishima, Fibonacci numbers (n = 301 to 400).

Hisanori Mishima, Fibonacci numbers (n = 401 to 480).

Formula

a(n) = A000045(A072396(n)). - Alois P. Heinz, Apr 10 2018

Example

21 is the 2nd term because 21 is the smallest Fibonacci number having 2 prime factors.

Crossrefs

Cf. A000045, A072396.

Row n=1 of A303216.

Sequence in context: A105666 A058261 A298822 * A077208 A321534 A212483

Adjacent sequences: A072394 A072395 A072396 * A072398 A072399 A072400

Keyword

nonn

Author

Shyam Sunder Gupta, Jul 21 2002

Extensions

a(17) from Alois P. Heinz, Apr 10 2018

Status

approved