cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A359877 a(n) is the smallest tetranacci number (A000078) with exactly n prime factors (counted with multiplicity).

Original entry on oeis.org

1, 2, 4, 8, 56, 108, 5536, 28074040, 39648, 147312, 18566888967365603514688, 9966792788887776, 2775641472, 2505471397838180985096739296, 1445523368993397560000765219760086502994234237205516083525719052320, 44092571484448511101335177770183225655413760
Offset: 0

Views

Author

Ilya Gutkovskiy, Jan 16 2023

Keywords

Examples

			a(6) = 5536, because 5536 is a tetranacci number with 6 prime factors (counted with multiplicity) {2, 2, 2, 2, 2, 173} and this is the smallest such number.

Links

Crossrefs

Cf. A000078, A001222, A072397, A359849, A359876, A359879.

A359878 a(n) is the index of the smallest tribonacci number (A000073) with exactly n prime factors (counted with multiplicity).

Original entry on oeis.org

2, 4, 5, 9, 8, 17, 13, 52, 16, 40, 36, 32, 62, 88, 96, 144, 112, 221, 256, 208, 400, 192
Offset: 0

Views

Author

Ilya Gutkovskiy, Jan 16 2023

Keywords

Links

Crossrefs

Cf. A000073, A001222, A072396, A359850, A359876, A359879.

Extensions

a(17)-a(21) from Daniel Suteu, Jan 18 2023

A359880 a(n) is the smallest Fibonacci n-step number with exactly n prime factors (counted with multiplicity).

Original entry on oeis.org

21, 44, 56, 120, 1936, 2000, 2035872, 32512, 265816832, 523008, 8565824256, 67047424, 134156288, 1073463296, 35176050802688, 8589344768, 562914520154112, 18013762856812544, 144112508021833728, 2305819919496904704, 1099509006336, 137438822400
Offset: 2

Views

Author

Ilya Gutkovskiy, Jan 16 2023

Keywords

Examples

			a(3) = 44, because 44 is a tribonacci number with 3 prime factors (counted with multiplicity) {2, 2, 11} and this is the smallest such number.

Links

Crossrefs

Cf. A001222, A072397, A359852, A359876, A359877, A359881.
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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