A100973 - OEIS

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A100973

Integers that are Rhonda numbers to base 9.

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

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

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

Adjacent sequences: A100970 A100971 A100972 * A100974 A100975 A100976

KEYWORD

easy,nonn,base

AUTHOR

Mark Hudson (mrmarkhudson(AT)hotmail.com), Nov 25 2004

STATUS

approved