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A139750
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Numbers n such that d_1^1 + ... + d_r^r is a prime number, where d_i are the digits of n (n = concatenation of d_1, d_2, ..., d_r).
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4
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2, 3, 5, 7, 11, 12, 14, 16, 20, 21, 23, 29, 30, 32, 34, 38, 41, 43, 45, 47, 50, 56, 61, 65, 70, 72, 74, 76, 78, 83, 89, 92, 98, 101, 110, 111, 113, 115, 120, 122, 131, 133, 137, 139, 140, 146, 153, 155, 160, 164, 182, 186, 188, 191, 193, 199, 200, 201, 203, 205, 210
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Harvey P. Dale, Table of n, a(n) for n = 1..1000
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MATHEMATICA
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dpnQ[n_]:=Module[{idn=IntegerDigits[n]}, PrimeQ[Total[idn^Range[ Length[idn]]]]]; Select[Range[300], dpnQ] (* From Harvey P. Dale, Mar 26 2012 *)
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CROSSREFS
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Cf. A139752.
Sequence in context: A212127 A028835 A028834 * A139749 A178357 A205667
Adjacent sequences: A139747 A139748 A139749 * A139751 A139752 A139753
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KEYWORD
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base,easy,nonn,less
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AUTHOR
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Ctibor O. Zizka, May 19 2008
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EXTENSIONS
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Edited and extended by Klaus Brockhaus, May 21 2008
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STATUS
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approved
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