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A100970 Integers n that are Rhonda numbers to base 8. 17
1836, 6318, 6622, 10530, 14500, 14739, 17655, 18550, 25398, 25956, 30562, 39215, 39325, 50875, 51429, 52887, 55611, 56420, 58548, 59731, 60604, 72358, 74620, 76581, 78780, 81370, 84180, 85949, 103350, 103788, 108750, 112914, 118233 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
See A099542 for definition of Rhonda numbers and some links.
LINKS
Eric Weisstein's World of Mathematics, Rhonda Number
Wikipedia, Octal
EXAMPLE
Product of base 8 digits of 1836 is 3*4*5*4=240 and sum of prime factors of 1826 is 2*2+3*3+17=30 and 240=8*30.
MATHEMATICA
rhda8Q[n_]:=Times@@IntegerDigits[n, 8]==8*Total[Times@@@FactorInteger[n]]; Select[Range[120000], rhda8Q] (* Harvey P. Dale, Jul 10 2021 *)
PROG
(Haskell)
a100970 n = a100970_list !! (n-1)
a100970_list = filter (rhonda 8) a255805_list
-- Function rhonda as in A099542.
-- Reinhard Zumkeller, Mar 08 2015
CROSSREFS
Cf. Rhonda numbers to other bases: A100968 (base 4), A100969 (base 6), A100973 (base 9), 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, A007094, subsequence of A255805.
Column k=3 of A291925.
Sequence in context: A185484 A133539 A234492 * A159202 A238294 A274683
KEYWORD
easy,nonn,base
AUTHOR
Mark Hudson (mrmarkhudson(AT)hotmail.com), Nov 24 2004
STATUS
approved

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Last modified April 21 14:48 EDT 2024. Contains 371874 sequences. (Running on oeis4.)