Numbers k not divisible by 3 such that no prime is the concatenation of two numbers whose sum is n.

Terms

a(0) =4477a(1) =5698a(2) =110297a(3) =116809a(4) =183557a(5) =216931a(6) =220594a(7) =233618a(8) =417175a(9) =483923a(10) =567358a(11) =634106a(12) =684167a(13) =717541a(14) =772079a(15) =834350a(16) =867724a(17) =984533a(18) =19940965a(19) =43870123a(20) =51846509a(21) =52721966a(22) =67799281a(23) =91728439a(24) =103693018a(25) =105443932a(26) =115657597a(27) =131804915a(28) =139586755a(29) =151551334