Composite numbers k = concat(x,LSD(k)) such that k' = x', where k' is the arithmetic derivative of k.

A293478

Composite numbers k = concat(x,LSD(k)) such that k' = x', where k' is the arithmetic derivative of k.

Terms

    a(0) =17251a(1) =109999a(2) =112639a(3) =130733a(4) =269119a(5) =318293a(6) =390319a(7) =463669a(8) =1319519a(9) =1726541a(10) =1841839a(11) =2010719a(12) =2013187a(13) =2311919a(14) =5780221a(15) =6493519a(16) =7355839a(17) =7533599a(18) =10668773a(19) =12652639a(20) =14650639a(21) =14951999a(22) =21098459a(23) =21500071a(24) =25167845a(25) =31008319a(26) =35807999a(27) =38687599a(28) =39458719

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