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A359230 a(n) is the index of the smallest square pyramidal number with exactly n distinct prime factors. 1
1, 2, 3, 4, 17, 27, 76, 220, 747, 2232, 5719, 18980, 159340, 437580, 1672307, 10891075, 78604064 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Table of n, a(n) for n=0..16.
Eric Weisstein's World of Mathematics, Distinct Prime Factors
Eric Weisstein's World of Mathematics, Square Pyramidal Number
CROSSREFS
Cf. A000330, A001221, A359193, A359229.
Sequence in context: A111191 A333825 A115891 * A293035 A037394 A037430
Adjacent sequences: A359227 A359228 A359229 * A359231 A359232 A359233
KEYWORD
nonn,more
AUTHOR
Ilya Gutkovskiy, Dec 22 2022
EXTENSIONS
a(16) from Jon E. Schoenfield, Dec 22 2022
STATUS
approved

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Last modified May 21 15:23 EDT 2024. Contains 372738 sequences. (Running on oeis4.)