A121035 - OEIS

A121035

Multiples of 15 containing a 15 in their decimal representation.

15, 150, 315, 615, 915, 1155, 1215, 1500, 1515, 1530, 1545, 1560, 1575, 1590, 1815, 2115, 2415, 2715, 3015, 3150, 3315, 3615, 3915, 4155, 4215, 4515, 4815, 5115, 5415, 5715, 6015, 6150, 6315, 6615, 6915, 7155, 7215, 7515, 7815, 8115, 8415, 8715, 9015

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

OFFSET

1,1

LINKS

Paolo Xausa, Table of n, a(n) for n = 1..10000

Index entries for 10-automatic sequences.

FORMULA

a(n) ~ 15n. - Charles R Greathouse IV, Nov 02 2022

MATHEMATICA

Select[15*Range[1000], StringContainsQ[IntegerString[#], "15"] &] (* Paolo Xausa, Feb 25 2024 *)

PROG

(PARI) is(n)=if(n%15, return(0)); while(n>14, if(n%100==15, return(1)); n\=10); 0 \\ Charles R Greathouse IV, Feb 12 2017