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Search: id:A140175
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| A140175 |
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Numbers n such that n=prime((d_1*d_2*...*d_k)*(d_1+d_2+...+d_k)) where d_1d_2...d_k is the decimal expansion of n. |
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+0
2
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OFFSET
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1,1
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EXAMPLE
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63882851=prime((6*3*8*8*2*8*5*1)*(6+3+8+8+2+8+5+1)).
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MATHEMATICA
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fQ[n_] := Block[{id = IntegerDigits@ n}, n == Prime[Plus @@ id Times @@ id]]; k = 1; lst = {}; While[ k < 10^8, If[ fQ@n, AppendTo[lst, k]; Print@ n]; k++ ]; lst (* RGWv *)
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CROSSREFS
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Cf. A097223.
Adjacent sequences: A140172 A140173 A140174 this_sequence A140176 A140177 A140178
Sequence in context: A035900 A108009 A051649 this_sequence A116226 A115446 A139410
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KEYWORD
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base,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Jun 09 2008
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