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A175514 Numbers n such that the base 2 expansion of n ends with the base 5 expansion of n. 1
0, 1, 30, 31, 3900, 3901, 93900, 93901, 97000, 97001, 1270000000, 1270000001, 496864267596900, 496864267596901, 596044970707000, 596044970707001, 300522773449238130, 300522773449238131, 1549835974179703900, 1549835974179703901, 39043445740978906900, 39043445740978906901, 1156389717140148910000, 1156389717140148910001, 4850340461737111735130, 4850340461737111735131 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

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

LINKS

Table of n, a(n) for n=1..26.

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

Offset corrected and terms a(20)-a(26) added by Max Alekseyev, Sep 22 2016

STATUS

approved

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Last modified March 28 05:07 EDT 2017. Contains 284182 sequences.