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1, 5, 5, 25, 5, 25, 25, 125, 5, 25, 25, 125, 25, 125, 125, 625, 5, 25, 25, 125, 25, 125, 125, 625, 25, 125, 125, 625, 125, 625, 625, 3125, 5, 25, 25, 125, 25, 125, 125, 625, 25, 125, 125, 625, 125, 625, 625, 3125, 25, 125, 125, 625, 125, 625, 625, 3125, 125, 625, 625, 3125, 625, 3125, 3125, 15625
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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Also, a row of the square array A256140.
It appears that when A151780 is regarded as a triangle in which the row lengths are the powers of 2, this is what the rows converge to.
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LINKS
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Table of n, a(n) for n=0..63.
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FORMULA
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a(n) = A000351(A000120(n)). - Michel Marcus, Mar 21 2015
G.f.: Product_{k>=0} (1 + 5*x^(2^k)). - Ilya Gutkovskiy, Feb 28 2017
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EXAMPLE
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Also, written as an irregular triangle in which the row lengths are the terms of A011782, the sequence begins:
1;
5;
5, 25;
5, 25, 25, 125;
5, 25, 25, 125, 25, 125, 125, 625;
...
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MATHEMATICA
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5^# & /@ Nest[Join[#, # + 1] &, {0}, 6] (* Michael De Vlieger, Mar 20 2015, after IWABUCHI Yu(u)ki at a000120 *)
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PROG
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(PARI) a(n) = 5^hammingweight(n); \\ Michel Marcus, Mar 21 2015
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CROSSREFS
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Cf. A000120, A001316, A048883, A102376, A130667, A151780, A256140, A256141.
Sequence in context: A165826 A256693 A255458 * A227076 A223186 A071340
Adjacent sequences: A256132 A256133 A256134 * A256136 A256137 A256138
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol, Mar 19 2015
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EXTENSIONS
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More terms from Michael De Vlieger, Mar 20 2015
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STATUS
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approved
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