A359851 -id:A359851 - cp's OEIS frontend

A359849 a(n) is the smallest tetranacci number (A000078) with exactly n distinct prime factors.

1, 2, 15, 1490, 39648, 28074040, 100808458960497, 9966792788887776, 4997150614173857218560, 1835682610171974487231869, 889487735339682550112673527109223032, 52499930084496170026238596234557616056408988199026780675759699719704592

Offset: 0

Ilya Gutkovskiy, Jan 15 2023

nonn

			a(4) = 39648, because 39648 is a tetranacci number with 4 distinct prime factors {2, 3, 7, 59} and this is the smallest such number.

Eric Weisstein's World of Mathematics, Distinct Prime Factors
Eric Weisstein's World of Mathematics, Tetranacci Number

Cf. A000078, A001221, A060319, A359848, A359851.

a(n) = A000078(A359851(n)). - Daniel Suteu, Jan 18 2023

a(11) from Daniel Suteu, Jan 18 2023

A359850 a(n) is the index of the smallest tribonacci number (A000073) with exactly n distinct prime factors.

Original entry on oeis.org

2, 4, 8, 13, 20, 29, 49, 56, 101, 93, 124, 268, 221

Offset: 0

Ilya Gutkovskiy, Jan 15 2023

Eric Weisstein's World of Mathematics, Distinct Prime Factors
Eric Weisstein's World of Mathematics, Tribonacci Number

Cf. A000073, A001221, A060320, A359848, A359851.

a(11)-a(12) from Daniel Suteu, Jan 17 2023

A359879 a(n) is the index of the smallest tetranacci number (A000078) with exactly n prime factors (counted with multiplicity).

Original entry on oeis.org

3, 5, 6, 7, 10, 11, 17, 30, 20, 22, 82, 60, 37, 100, 236, 157, 156, 242, 240

Offset: 0

Ilya Gutkovskiy, Jan 16 2023

a(19) > 400. - Daniel Suteu, Jan 18 2023

Eric Weisstein's World of Mathematics, Prime Factor
Eric Weisstein's World of Mathematics, Tetranacci Number

Cf. A000078, A001222, A072396, A359851, A359877, A359878.

a(18) from Daniel Suteu, Jan 18 2023

A359853 a(n) is the index of the smallest Fibonacci n-step number with exactly n distinct prime factors.

Original entry on oeis.org

8, 13, 20, 18, 50, 56, 73, 95, 267

Offset: 2

Ilya Gutkovskiy, Jan 15 2023

Eric Weisstein's World of Mathematics, Distinct Prime Factors
Eric Weisstein's World of Mathematics, Fibonacci n-Step Number

Cf. A001221, A060320, A359850, A359851, A359852.

a(10) from Jinyuan Wang, Jan 17 2023

cp's OEIS Frontend

A359849 a(n) is the smallest tetranacci number (A000078) with exactly n distinct prime factors.

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A359850 a(n) is the index of the smallest tribonacci number (A000073) with exactly n distinct prime factors.

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A359879 a(n) is the index of the smallest tetranacci number (A000078) with exactly n prime factors (counted with multiplicity).

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A359853 a(n) is the index of the smallest Fibonacci n-step number with exactly n distinct prime factors.

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