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A036971
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Numbers k such that the k-th Fibonacci number reversed is prime.
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3
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3, 4, 5, 7, 9, 14, 17, 21, 25, 26, 65, 98, 175, 191, 382, 497, 653, 1577, 1942, 1958, 2405, 4246, 4878, 5367, 9142, 9318, 10921, 17833, 20433, 50373, 66571, 85098, 93699, 104075
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OFFSET
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1,1
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COMMENTS
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Numbers k such that the k-th Fibonacci number appears in A095179. - Iain Fox, Oct 28 2017
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LINKS
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Table of n, a(n) for n=1..34.
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MAPLE
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revdigs:= proc(n) local L;
L:= convert(n, base, 10);
add(L[-i]*10^(i-1), i=1..nops(L))
end proc:
select(isprime@revdigs@combinat:-fibonacci, [$1..10000]); # Robert Israel, Oct 29 2017
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MATHEMATICA
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a = Table[FromDigits[Reverse[IntegerDigits[Fibonacci[j]]]], {j, 10000}]; b = Select[a, PrimeQ[ # ] &]; Flatten[Table[Position[a, b[[i]]], {i, 1, Length[b]}]]
Select[Range[9400], PrimeQ[IntegerReverse[Fibonacci[#]]]&] (* The program uses the IntegerReverse function from Mathematica version 10 *) (* Harvey P. Dale, Dec 08 2015 *)
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PROG
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(PARI) lista(nn) = for(n=3, nn, if(ispseudoprime(eval(concat(Vecrev(Str(fibonacci(n)))))), print1(n, ", "))) \\ Iain Fox, Oct 28 2017
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CROSSREFS
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Cf. A036797, A036972, A095179.
Sequence in context: A067530 A259796 A082922 * A000702 A067526 A101760
Adjacent sequences: A036968 A036969 A036970 * A036972 A036973 A036974
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KEYWORD
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nonn,base,more
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AUTHOR
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G. L. Honaker, Jr., Carlos Rivera
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EXTENSIONS
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a(25)-a(26) from Vit Planocka (planocka(AT)mistral.cz), Feb 25 2003
Offset corrected by Arkadiusz Wesolowski, Jan 12 2012
a(27)-a(31) from Iain Fox, Oct 28 2017
a(32)-a(33) from Iain Fox, Oct 29 2017
a(34) from Iain Fox, Aug 24 2021
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STATUS
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approved
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