Search: id:A053782
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%I A053782
%S A053782 5,14,17,20,35,36,37,43,47,48,53,54,63,64,68,73,74,75,86,101,106,127,
%T A053782 142,149,154,159,208,209,214,221,231,234,250,254,258,259,272,283,302,
%U A053782 304,329,332,346,352,374,398,417,424,439,440,445,458,471,550,551,556
%N A053782 Sum of first n composite numbers is prime.
%t A053782 f[ n_Integer ] := Block[ {k = n + PrimePi[ n ] + 1}, While[ k - PrimePi[ 
               k ] - 1 != n, k++ ]; k ]; s = 0; Do[ s = s + f[ n ]; If[ PrimeQ[ 
               s ], Print[ n ] ], {n, 1, 1000} ]
%Y A053782 Cf. A002808, A000040, A053872, A013919.
%Y A053782 Sequence in context: A160709 A067113 A101774 this_sequence A102884 A071852 
               A022139
%Y A053782 Adjacent sequences: A053779 A053780 A053781 this_sequence A053783 A053784 
               A053785
%K A053782 nonn
%O A053782 1,1
%A A053782 G. L. Honaker, Jr. (honak3r(AT)gmail.com), Mar 30 2000
%E A053782 More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 22 2001

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