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A359877 a(n) is the smallest tetranacci number (A000078) with exactly n prime factors (counted with multiplicity). 3
1, 2, 4, 8, 56, 108, 5536, 28074040, 39648, 147312, 18566888967365603514688, 9966792788887776, 2775641472, 2505471397838180985096739296, 1445523368993397560000765219760086502994234237205516083525719052320, 44092571484448511101335177770183225655413760 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, Prime Factor
Eric Weisstein's World of Mathematics, Tetranacci Number
EXAMPLE
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.
CROSSREFS
Sequence in context: A018446 A289324 A338302 * A068620 A073953 A206850
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jan 16 2023
STATUS
approved

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Last modified June 21 01:13 EDT 2024. Contains 373535 sequences. (Running on oeis4.)