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A360299
a(n) is the number of terms in the n-th row of A360298.
2
1, 1, 1, 1, 1, 2, 2, 3, 5, 10, 10, 15, 15, 29, 44, 73, 73, 136, 136, 264, 383, 740, 740, 1418, 2440, 4727, 7831, 15154, 15154, 25836, 25836, 46502, 69638, 139276, 240132, 447972, 447972, 880859, 1343707, 2448270, 2448270, 4742231, 4742231, 9309245, 17932278
OFFSET
1,6
FORMULA
a(n) <= a(n+1) <= 2*a(n).
a(p) = a(p-1) for any prime number p.
EXAMPLE
For n = 9:
- the 9th row of A360298 is (10080, 70, 5670, 4480, 362880),
- so a(9) = 5.
PROG
(PARI) See Links section.
CROSSREFS
Cf. A360298.
Sequence in context: A208437 A130377 A260956 * A344708 A322113 A153900
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Feb 02 2023
STATUS
approved