The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.



Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A210653 Numbers having a digit 0 or 5 whose waterfall sequence does not end in 0,0,0,.... 1


%S 59,195,295,395,475,495,519,533,534,536,537,538,539,547,549,566,568,

%T 572,573,574,576,577,578,579,586,588,589,591,592,593,594,596,597,598,

%U 599,665,675,685,745,759,775,795,895,935,945,957,959,975,1175,1195,1245,1275

%N Numbers having a digit 0 or 5 whose waterfall sequence does not end in 0,0,0,....

%C The "waterfall" sequence S for a given starting value S(1)>9 is defined as S(n)=d(n)*d(n-1) (n>1), where d(n) is the n-th digit of the sequence.

%C Initial values having a digit 0 or 5 are likely to end in repeating zeros, which motivates the definition of this sequence. See A210652 for further information.

%o (PARI) is_A210653(n)= setintersect(["0","5"],Set(Vec(Str(n)))) & !is_A210652(n)

%o for(n=10,1999, is_A210653(n) & print1(n", "))

%Y Cf. A210614.

%K nonn,base

%O 1,1

%A _M. F. Hasler_, Mar 27 2012

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 3 13:43 EST 2021. Contains 349463 sequences. (Running on oeis4.)