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Search: a356063 -id:a356063
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a(n) is the smallest integer that has exactly n Lucas divisors (A000032).
+10
3
1, 2, 4, 12, 36, 252, 2772, 52668, 1211364, 35129556, 1089016236, 44649665676, 2098534286772, 417608323067628, 88115356167269508, 24760415083002731748, 7948093241643876891108, 4140956578896459860267268
OFFSET
1,2
COMMENTS
The new Lucas numbers that appear at each step are in A356063.
EXAMPLE
36 is divisible by 1, 2, 3, 4, 18, which are all Lucas numbers, and no integer < 36 has 5 divisors that are Lucas numbers, hence a(5) = 36.
CROSSREFS
Similar sequences: A087997 (palindromes), A129655 (Fibonacci), A333456 (Niven).
KEYWORD
nonn,more
AUTHOR
Bernard Schott, Jul 25 2022
EXTENSIONS
a(10) from Amiram Eldar, Jul 25 2022
a(11)-a(18) from David A. Corneth, Jul 27 2022
STATUS
approved

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