OFFSET
1,1
LINKS
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
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Reinhard Zumkeller, Jul 21 2006, Jul 26 2006
STATUS
approved