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A156223
Numbers that are products of distinct terms in A000312.
4
1, 4, 27, 108, 256, 1024, 3125, 6912, 12500, 27648, 46656, 84375, 186624, 337500, 800000, 823543, 1259712, 3200000, 3294172, 5038848, 11943936, 16777216, 21600000, 22235661, 47775744, 67108864, 86400000, 88942644, 145800000, 210827008, 322486272, 387420489, 452984832
OFFSET
1,2
LINKS
EXAMPLE
a(1) = 1 = 1^1.
a(2) = 4 = 2^2.
a(3) = 108 = 2^2 * 3^3.
...
a(20) = 5038848 = 2^2 * 3^3 * 6^6.
MATHEMATICA
seq[max_] := Module[{kmax = 1, s = {1}}, While[kmax^kmax < max, kmax++]; Do[s = Select[Union[s, k^k*s], # <= max &], {k, 1, kmax}]; s]; seq[10^8] (* Amiram Eldar, Nov 24 2020 *)
CROSSREFS
Cf. A000312.
Sequence in context: A071175 A352331 A063262 * A048102 A171469 A267685
KEYWORD
nonn
AUTHOR
Gabriel C. Benamy, Feb 06 2009
EXTENSIONS
More terms from Amiram Eldar, Nov 24 2020
STATUS
approved