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A139178 Numbers n such that n=(pi(d_1)+pi(d_1!)+pi(d_1!!))+...+ (pi(d_k)+pi(d_k!)+pi(d_k!!)) where d_1 d_2 ... d_k is the decimal expansion of n. 0

%I #2 Mar 30 2012 17:37:44

%S 54,713,724,4348

%N Numbers n such that n=(pi(d_1)+pi(d_1!)+pi(d_1!!))+...+ (pi(d_k)+pi(d_k!)+pi(d_k!!)) where d_1 d_2 ... d_k is the decimal expansion of n.

%e 4348=(pi(4)+pi(4!)+pi(4!!))+(pi(3)+pi(3!)+pi(3!!))+(pi(4)+ pi(4!)+pi(4!!))+(pi(8)+pi(8!)+pi(8!!)) so 4348 is in the sequence.

%K base,fini,full,nonn

%O 1,1

%A _Farideh Firoozbakht_, Apr 12 2008

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Last modified August 3 15:38 EDT 2024. Contains 374894 sequences. (Running on oeis4.)