A121031 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A121031

Multiples of 11 containing an 11 in their decimal representation.

11, 110, 1100, 1111, 1122, 1133, 1144, 1155, 1166, 1177, 1188, 1199, 2112, 2211, 3113, 3311, 4114, 4411, 5115, 5511, 6116, 6611, 7117, 7711, 8118, 8811, 9119, 9911, 11000, 11011, 11022, 11033, 11044, 11055, 11066, 11077, 11088, 11099, 11110

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Index entries for 10-automatic sequences.

FORMULA

a(n) ~ 11n. - Charles R Greathouse IV, Feb 12 2017

MATHEMATICA

Select[11*Range[1100], MemberQ[Partition[IntegerDigits[#], 2, 1], {1, 1}]&] (* Harvey P. Dale, Feb 16 2014 *)

Select[11Range[1100], SequenceCount[IntegerDigits[#], {1, 1}]>0&] (* Harvey P. Dale, Jun 14 2024 *)

PROG

(PARI) is(n)=if(n%11, return(0)); while(n>10, if(n%100==11, return(1)); n\=10); 0 \\ Charles R Greathouse IV, Feb 12 2017

CROSSREFS

Cf. A121041, A008593, A011531, A121022, A121023, A121024, A121025, A121026, A121027, A121028, A121029, A121030, A121032, A121033, A121034, A121035, A121036, A121037, A121038, A121039, A121040.

Sequence in context: A190871 A097784 A352574 * A115804 A162987 A163404

Adjacent sequences: A121028 A121029 A121030 * A121032 A121033 A121034

KEYWORD

nonn,base,easy

AUTHOR

Reinhard Zumkeller, Jul 21 2006

STATUS

approved