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Search: id:A109571
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| A109571 |
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Prague bus clock sequence #2. |
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+0
2
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| 1, 1, 8, 1, 1, 8, 1, 1, 28, 1, 9, 1, 1, 8, 1, 1, 8, 1, 1, 28, 1, 9, 1, 1, 8, 1, 1, 8, 1, 1, 28, 1, 129, 1, 1, 8, 1, 1, 8, 1, 1, 28, 1, 249, 1, 1, 8, 1, 1, 8, 1, 1, 28, 1, 9, 1, 1, 8, 1, 1, 8, 1, 1, 28, 1, 9, 1, 1, 8, 1, 8, 1, 1, 28, 1, 129, 1, 1, 8, 1, 1, 8, 1, 1, 28, 1, 249, 1, 1, 8, 1, 1, 8, 1, 1, 28, 1, 9
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Start a digital clock at midnight; you read 00:00 (hours and minutes). Wait for 1 minute and read 00:01; if you look at 00:01 in a mirror, you'll see 10:00, which is a sound time on such a clock; wait for another minute and read 00:02; this gives the "mirror time" 20:00, which is sound; you must wait now for 8 minutes before seeing another sound "mirror time": 00:10 gives 01:00; etc. Successive waiting times form the sequence. The "mirror digit transform" is: 0->0, 1->1, 2->5, 5->2 and 8->8. "8" can't be used here and "5" must be carefully placed.
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EXAMPLE
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Successive number of minutes one has to wait, starting at midnight, to read a sound "mirror" time on a digital clock.
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CROSSREFS
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Cf. A028354, A109527.
Sequence in context: A159822 A010151 A021556 this_sequence A133823 A146881 A131067
Adjacent sequences: A109568 A109569 A109570 this_sequence A109572 A109573 A109574
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KEYWORD
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base,easy,fini,nonn
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AUTHOR
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E. Angelini and others (eric.angelini(AT)kntv.be), Aug 30 2005
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