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A272327 Table read by antidiagonals: T(n, k) is the least i > n such that n divides i^k (n > 0, k > 0). 1
2, 4, 2, 6, 4, 2, 8, 6, 4, 2, 10, 6, 6, 4, 2, 12, 10, 6, 6, 4, 2, 14, 12, 10, 6, 6, 4, 2, 16, 14, 12, 10, 6, 6, 4, 2, 18, 12, 14, 12, 10, 6, 6, 4, 2, 20, 12, 10, 14, 12, 10, 6, 6, 4, 2, 22, 20, 12, 10, 14, 12, 10, 6, 6, 4, 2, 24, 22, 20, 12, 10, 14, 12, 10, 6 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
T(n, k) = 2*n for squarefree n.
LINKS
Peter Kagey, Rows n = 1..141, flattened
EXAMPLE
a(1) = T(1, 1) = 2 because 1 divides 2^1
a(2) = T(2, 1) = 4 because 2 divides 4^1
a(3) = T(1, 2) = 2 because 1 divides 2^2
a(4) = T(3, 1) = 6 because 3 divides 6^1
a(5) = T(2, 2) = 4 because 2 divides 4^2
a(6) = T(1, 3) = 2 because 1 divides 2^3
a(7) = T(4, 1) = 8 because 4 divides 8^1
a(8) = T(3, 2) = 6 because 3 divides 6^2
a(9) = T(2, 3) = 4 because 2 divides 4^3
a(10) = T(1, 4) = 2 because 1 divides 2^4
Triangle begins:
2 2 2 2 2 2
4 4 4 4 4
6 6 6 6
8 6 6
10 10
12
MATHEMATICA
Table[Function[m, SelectFirst[Range[m + 1, 10^3], Divisible[#^k, m] &]][n - k + 1], {n, 12}, {k, n}] // Flatten (* Michael De Vlieger, Apr 25 2016, Version 10 *)
CROSSREFS
Cf. A254732 (second column), A254733 (third column), A254734 (fourth column), A073353 (main diagonal).
Sequence in context: A328196 A323307 A215841 * A212012 A322071 A176342
KEYWORD
nonn,tabl
AUTHOR
Peter Kagey, Apr 25 2016
STATUS
approved

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Last modified April 14 18:28 EDT 2024. Contains 371667 sequences. (Running on oeis4.)