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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A100973 Integers that are Rhonda numbers to base 9. 17
15540, 21054, 25331, 44360, 44660, 44733, 47652, 50560, 54944, 76857, 77142, 83334, 83694, 96448, 97944, 106575, 108273, 117624, 125952, 138966, 141204, 144236, 153318, 158417, 159424, 188529, 188598, 189350, 192000, 192126, 196652 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
See sequence A099542 for definition of Rhonda numbers and for some links.
LINKS
Eric Weisstein's World of Mathematics, Rhonda Number
EXAMPLE
The product of the base 9 digits of 15540 is 2*3*2*7*6=504, the sum of the prime factors of 15540 is 2*2+3+5+7+37=56 and 504=9*56. So 15540 is a Rhonda number to base 9.
PROG
(Haskell)
a100973 n = a100973_list !! (n-1)
a100973_list = filter (rhonda 9) a255808_list
-- Function rhonda as in A099542.
-- Reinhard Zumkeller, Mar 08 2015
CROSSREFS
Cf. Rhonda numbers to other bases: A100968 (base 4), A100969 (base 6), A100970 (base 8), A099542 (base 10), A100971 (base 12), A100972 (base 14), A100974 (base 15), A100975 (base 16), A255735 (base 18), A255732 (base 20), A255736 (base 30), A255731 (base 60), see also A255872.
Cf. A001414, A027746, A007095, subsequence of A255808.
Column k=4 of A291925.
Sequence in context: A201344 A235278 A329769 * A247692 A262793 A206104
KEYWORD
easy,nonn,base
AUTHOR
Mark Hudson (mrmarkhudson(AT)hotmail.com), Nov 25 2004
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 21 14:30 EDT 2024. Contains 371874 sequences. (Running on oeis4.)