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A208259 Numbers starting and ending with digit 1. 3
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)
OFFSET

1,2

COMMENTS

Union of A062332 and A208260. Supersequence of A208262 (numbers with all divisors starting and ending with digit 1).

LINKS

Table of n, a(n) for n=1..46.

MATHEMATICA

Select[Range[2000], First[IntegerDigits[#]] == 1 && Last[IntegerDigits[#]] == 1 &] (* From Vladimir Joseph Stephan Orlovsky, Feb 26 2012 *)

CROSSREFS

Cf. A062332 (primes starting and ending with a digit 1), A208260 (nonprime numbers starting and ending with a digit 1).

Sequence in context: A043494 A038444 A115824 * A043036 A072001 A099821

Adjacent sequences:  A208256 A208257 A208258 * A208260 A208261 A208262

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Feb 24 2012

STATUS

approved

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Last modified May 21 14:02 EDT 2013. Contains 225489 sequences.