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A101172 Sequence whose Mobius transform leads to the first differences of the terms. 1

%I #7 Aug 18 2019 14:04:54

%S 1,2,3,5,8,15,26,51,97,191,373,745,1472,2943,5859,11708,23365,46729,

%T 93349,186697,373200,746372,1492370,2984739,5968687,11937366,23873259,

%U 47746421,95489896,190979791,381953529,763907057,1527790748,1527802406

%N Sequence whose Mobius transform leads to the first differences of the terms.

%C In the example, the last value in the Mobius transform of [1,2,3,5,8] is 7 and so the next term in our sequence is 8+7=15. Then, the Mobius transform of [1,2,3,5,8,15] is [1,1,2,3,7,11], which means that the next term of our sequence is 15+11=26, etc.

%e For example, the Mobius transform of the segment [1,2,3,5,8] begins [1,1,2,3], which are the first differences of these terms.

%p with(numtheory): F:={1}: f:=n->F[n]: g:=n->sum(mobius(divisors(n)[j])*f(n/divisors(n)[j]),j=1..tau(n)): for n from 1 to 35 do F:=F union {F[nops(F)]+g(n)} od: G:=sort(convert(F,list)); # _Emeric Deutsch_, Feb 15 2005

%K easy,nonn

%O 1,2

%A Mark Hudson (mrmarkhudson(AT)hotmail.com), Dec 03 2004

%E Corrected and extended by _Emeric Deutsch_, Feb 15 2005

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Last modified September 10 09:32 EDT 2024. Contains 375786 sequences. (Running on oeis4.)