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A233819 Least odd integer of each prime signature ordered by prime signatures occurrence. 3
1, 3, 9, 15, 27, 45, 81, 135, 105, 243, 225, 405, 315, 729, 675, 1215, 945, 2187, 2025, 1575, 3645, 1155, 3375, 2835, 6561, 6075, 4725, 10935, 3465, 10125, 8505, 19683, 18225, 14175, 32805, 10395, 30375, 11025, 25515, 59049, 23625, 54675, 17325, 50625, 42525, 98415, 31185, 91125, 33075, 76545, 177147, 70875 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(n) is the least odd integer with the same prime signature as A025487(n).
LINKS
Will Nicholes, Prime Signatures
FORMULA
a(n) = A003961(A025487(n)). - Amiram Eldar, Jun 23 2019
EXAMPLE
a(7) is the first odd integer with prime signature {1,3} = 3^3*5 = 135.
a(8) is the first odd integer with prime signature {1,1,1} = 3*5*7 = 105.
CROSSREFS
Sequence in context: A363523 A339886 A147516 * A131822 A131801 A280963
KEYWORD
nonn
AUTHOR
Lior Manor, Dec 16 2013
STATUS
approved

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Last modified March 19 06:56 EDT 2024. Contains 370953 sequences. (Running on oeis4.)