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A208262 Numbers with all divisors starting and ending with digit 1. 3
1, 11, 101, 121, 131, 151, 181, 191, 1021, 1031, 1051, 1061, 1091, 1111, 1151, 1171, 1181, 1201, 1231, 1291, 1301, 1321, 1331, 1361, 1381, 1441, 1451, 1471, 1481, 1511, 1531, 1571, 1601, 1621, 1661, 1721, 1741, 1801, 1811, 1831, 1861, 1871, 1901, 1931, 1951, 1991 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Union of A062332 and A208261. Subsequence of A208259 (numbers starting and ending with digit 1).

LINKS

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

EXAMPLE

Divisors of 1111: 1, 11, 101, 1111.

MATHEMATICA

Select[Table[n, {n, 2000}], Union[First /@ IntegerDigits[Divisors[#]]] == {1} && Union[Last /@ IntegerDigits[Divisors[#]]] == {1} &] (* Vladimir Joseph Stephan Orlovsky, Feb 26 2012 *)

CROSSREFS

Cf. A062332 (primes starting and ending with digit 1), A208261 (nonprime numbers with all divisors starting and ending with digit 1).

Sequence in context: A176179 A176196 A303570 * A062696 A113654 A066592

Adjacent sequences:  A208259 A208260 A208261 * A208263 A208264 A208265

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Feb 24 2012

STATUS

approved

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Last modified October 23 22:42 EDT 2019. Contains 328378 sequences. (Running on oeis4.)