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A057899
Smallest positive integer such that n=a(n)^k-k with k a positive integer.
2
2, 2, 4, 5, 2, 7, 3, 9, 10, 11, 12, 2, 14, 4, 16, 17, 18, 19, 20, 21, 22, 23, 5, 3, 26, 27, 2, 29, 30, 31, 32, 33, 34, 6, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 7, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 2, 60, 61, 4, 8, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76
OFFSET
1,1
COMMENTS
It may be that positive integers can be written as n=m^k-k (with m and k > 1) in at most one way [checked up to 10000] as well as with k=1 and m=n+1.
FORMULA
a(n) = (n+A057898(n))^(1/A057898(n)).
EXAMPLE
a(5)=2 since 5=2^3-3
CROSSREFS
Sequence in context: A201509 A109295 A211188 * A210200 A119989 A137605
KEYWORD
nonn
AUTHOR
Henry Bottomley, Sep 26 2000
STATUS
approved