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A336580
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Numbers k such that A334676(k) = 1.
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2
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1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15, 24, 25, 35, 36, 45, 48, 72, 75, 125, 135, 140, 144, 175, 216, 225, 250, 270, 280, 288, 375, 384, 432, 540, 625, 675, 864, 875, 1080, 1125, 1250, 1296, 1350, 1575, 1620, 1680, 1728, 1750, 1800, 1875, 1944, 2160, 2250, 2500
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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This sequence is infinite as it contains the powers of 5.
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LINKS
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EXAMPLE
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Regarding the number 540:
- 540 / 4 = 135,
- 135 / 3 = 45,
- 45 / 5 = 9,
- 9 / 9 = 1,
- and 540 belongs to this sequence.
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PROG
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(PARI) for (n=1, #keep=vector(2500, n, n==1), if (keep[n], print1 (n ", "); for (d=2, min(9, #keep\n), if (setsearch (Set(digits(nd=n*d)), d), keep[nd]=1))))
(PARI) See Links section.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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