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A154521 The prime(n)-th digit of the concatenated positive nonprimes. 0

%I #8 Jul 16 2015 21:49:04

%S 4,6,9,0,4,5,8,0,2,6,7,2,4,5,8,2,6,8,1,4,5,8,2,5,0,4,5,7,8,1,0,2,5,6,

%T 2,0,0,1,1,4,6,1,0,2,2,2,2,3,4,3,6,0,4,4,6,8,2,5,5,6,5,1,6,9,7,1,7,8,

%U 4,8,6,8,9,9,9,0,2,0,6,0,3,1,7,1,2,1,4,2,0,3,2,7,4,3,4,7,9,4,5,6,6,8,2,4,7

%N The prime(n)-th digit of the concatenated positive nonprimes.

%C The digits of A129808 at prime indices.

%F a(n) = A129808(prime(n)) .

%p a129808 := [1] : for n from 4 to 400 do if not isprime(n) then a129808 := [op(a129808), op(ListTools[Reverse](convert(n,base,10))) ] ; fi; od:

%p for n from 1 do p := ithprime(n) ; printf("%d,", op(p,a129808) ) ; od: # _R. J. Mathar_, Aug 03 2009

%Y Cf. A000040, A154513, A154520.

%K nonn,base,less

%O 1,1

%A _Juri-Stepan Gerasimov_, Jan 11 2009

%E Edited and corrected by _R. J. Mathar_, Aug 03 2009

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Last modified March 29 09:32 EDT 2024. Contains 371268 sequences. (Running on oeis4.)