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 A175013 Sum of digits of n-th semiprime (or biprime). 5

%I #9 Mar 10 2019 00:35:18

%S 4,6,9,1,5,6,3,4,7,8,6,7,8,11,12,10,13,6,10,12,13,8,11,15,11,14,10,13,

%T 14,15,10,12,13,14,7,3,7,10,11,4,5,6,12,7,8,6,7,8,10,11,11,14,15,8,13,

%U 16,15,16,12,14,16,14,3,4,5,7,8,11,6,7,8,10,11,12,5,10,10,12,13,15,10

%N Sum of digits of n-th semiprime (or biprime).

%H Harvey P. Dale, <a href="/A175013/b175013.txt">Table of n, a(n) for n = 1..1000</a>

%p seq( A007953(A001358(n)),n=1..120) ; # _R. J. Mathar_, Aug 12 2010

%t Total[IntegerDigits[#]]&/@Select[Range[300],PrimeOmega[#]==2&] (* _Harvey P. Dale_, Jun 12 2012 *)

%Y Cf. A001358.

%K nonn,base

%O 1,1

%A _Juri-Stepan Gerasimov_, Apr 04 2010

%E Entries checked by _R. J. Mathar_, Aug 12 2010

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Last modified August 9 11:50 EDT 2024. Contains 375042 sequences. (Running on oeis4.)