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A320861
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Powers of 2 with initial digit 5.
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5
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512, 524288, 536870912, 549755813888, 562949953421312, 576460752303423488, 590295810358705651712, 5070602400912917605986812821504, 5192296858534827628530496329220096, 5316911983139663491615228241121378304, 5444517870735015415413993718908291383296
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listen;
history;
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OFFSET
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1,1
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LINKS
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MAPLE
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select(x->"5"=""||x[1], [2^n$n=0..160])[];
# Alternative:
Res:= NULL: count:= 0:
for k from 1 to 49 do
n:= ilog2(6*10^k);
if n > ilog2(5*10^k) then count:= count+1;
Res:= Res, 2^n;
fi
od:
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MATHEMATICA
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Select[2^Range[200], First[IntegerDigits[#]]==5 &] (* Vincenzo Librandi, Oct 25 2018 *)
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PROG
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(GAP) Filtered(List([0..160], n->2^n), i->ListOfDigits(i)[1]=5);
(PARI) lista(nn) = {for(n=1, nn, x = 2^n; if (digits(x=2^n)[1] == 5, print1(x, ", ")); ); } \\ Michel Marcus, Oct 25 2018
(Magma) [2^n: n in [1..200] | Intseq(2^n)[#Intseq(2^n)] eq 5]; // Vincenzo Librandi, Oct 25 2018
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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