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A177048 Least k such that k^n starts with n in base 2. 2
1, 2, 3, 2, 13, 11, 13, 2, 3, 25, 5, 7, 15, 35, 35, 2, 57, 31, 13, 77, 37, 23, 7, 29, 15, 25, 3, 51, 27, 61, 5, 2, 43, 37, 57, 25, 17, 31, 13, 69, 75, 13, 49, 9, 13, 75, 99, 45, 103, 57, 37, 35, 23, 25, 23, 75, 23, 295, 23, 163, 21, 5, 23, 2, 3, 79, 23, 123, 23, 345, 33, 5, 15 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
PROG
(Haskell)
toBinary 0 = []
toBinary n = toBinary (n `div` 2) ++ [odd n]
a = [1 + fromJust (findIndex (isPrefixOf (toBinary n)) [toBinary (k ^ n) | k <- [1..]]) | n <- [1..]]
CROSSREFS
Cf. A177047.
Sequence in context: A023641 A083775 A083784 * A160819 A299700 A205441
KEYWORD
nonn,base,easy
AUTHOR
EXTENSIONS
More terms from Seiichi Manyama, Dec 22 2019
STATUS
approved

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Last modified April 24 17:10 EDT 2024. Contains 371962 sequences. (Running on oeis4.)