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A229129
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Digital clock palindromic semiprimes.
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0
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4, 6, 9, 22, 33, 55, 111, 121, 141, 202, 303, 323, 505, 515, 535, 545, 626, 707, 717, 737, 939, 949, 959, 1111, 1441
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Palindromic semiprimes possible on a 24-hour digital clock, with no seconds. This is similar to A229107 as semiprimes (A001358) are to prime A000040, except this sequence has no seconds.
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LINKS
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FORMULA
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Digital clock semiprimes (A129336) INTERSECTION Palindromes in base 10 (A002113).
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CROSSREFS
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KEYWORD
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nonn,base,fini,full
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AUTHOR
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STATUS
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approved
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