

A175514


Numbers n such that the base2 expansion of n ends with the base5 expansion of n.


2



0, 1, 30, 31, 3900, 3901, 93900, 93901, 97000, 97001, 1270000000, 1270000001, 496864267596900, 496864267596901, 596044970707000, 596044970707001, 300522773449238130, 300522773449238131, 1549835974179703900, 1549835974179703901, 39043445740978906900, 39043445740978906901, 1156389717140148910000
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OFFSET

1,3


COMMENTS

Terms occur in pairs {10k,10k+1}.


LINKS

Max Alekseyev, Table of n, a(n) for n = 1..28


MATHEMATICA

n=0; nmax=10^8; While[n<=nmax, a=IntegerDigits[n, 2]; L=Length[a]; b=FromDigits[a, 5];
If[Mod[b, 2^L]==n, Print[{b, b+1}]]; n=n+2]; (* after Ray Chandler *)


CROSSREFS

Cf. A169828.
Sequence in context: A042856 A042857 A042858 * A043584 A043776 A043784
Adjacent sequences: A175511 A175512 A175513 * A175515 A175516 A175517


KEYWORD

base,nonn


AUTHOR

Zak Seidov, Jun 03 2010


EXTENSIONS

Terms a(20)a(28) from_Max Alekseyev, Sep 22 2016; Sep 03, 2020


STATUS

approved



