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A077806 Greatest prime factor of numbers containing in their decimal representation only the digits 0 and 1. 2
1, 5, 11, 5, 101, 11, 37, 5, 13, 101, 337, 11, 367, 37, 101, 5, 137, 13, 71, 101, 37, 337, 10111, 11, 193, 367, 13, 37, 653, 101, 271, 5, 9091, 137, 53, 13, 547, 71, 479, 101, 257, 37, 1217, 337, 101, 10111, 101111, 11, 991, 193, 137, 367, 4787, 13, 739, 37 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

FORMULA

a(n) = A006530(A007088(n)).

EXAMPLE

a(45) = A006530(A007088(45)) = A006530(101101) = A006530(7*11*13*101) = 101.

MATHEMATICA

FactorInteger[#][[-1, 1]]&/@Rest[FromDigits/@Tuples[{0, 1}, 6]] (* Harvey P. Dale, Feb 07 2015 *)

CROSSREFS

Cf. A077805, A020449.

Sequence in context: A145355 A110353 A097720 * A019305 A274266 A318259

Adjacent sequences:  A077803 A077804 A077805 * A077807 A077808 A077809

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Nov 16 2002

STATUS

approved

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Last modified May 16 19:46 EDT 2021. Contains 343951 sequences. (Running on oeis4.)