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A208259
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Numbers starting and ending with digit 1.
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8
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1, 11, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 1001, 1011, 1021, 1031, 1041, 1051, 1061, 1071, 1081, 1091, 1101, 1111, 1121, 1131, 1141, 1151, 1161, 1171, 1181, 1191, 1201, 1211, 1221, 1231, 1241, 1251, 1261, 1271, 1281, 1291, 1301, 1311, 1321, 1331
(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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Union of A062332 and A208260. Supersequence of A208262 (numbers with all divisors starting and ending with digit 1).
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LINKS
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MATHEMATICA
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PROG
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(Haskell)
a208259 n = a208259_list !! (n-1)
a208259_list = 1 : map ((+ 1) . (* 10)) a131835_list
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CROSSREFS
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Cf. A062332 (primes starting and ending with a digit 1), A208260 (nonprime numbers starting and ending with a digit 1).
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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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