A249599 Analog of A097717 in base 5.

1, 16, 3348, 411184, 5, 1262796336, 31415153952, 128, 639, 46402790906782052954848931760, 9548, 37884308119951668432, 507, 483747841655344, 2949712546290578068913640, 368402917173844349535205696, 3162, 1149642179207353109724066230688

Offset

1,2

Links

Lars Blomberg, Table of n, a(n) for n = 1..369

Example

a(2)=16, because in base 5, 16 is written 31 and 16/2 is 8 and written 13.

Maple

A249599 := proc(n)
    local m, b, mbas, msf ;
    b := 5;
    for m from 1 to 1999999 do
        mbas := convert(m, base, b) ;
        msf := [op(-1, mbas), op(1..nops(mbas)-1, mbas)] ;
        msf := add(op(i, msf)*b^(i-1), i=1..nops(msf)) ;
        if m/n = msf then
            return m;
        end if;
    end do:
    -1 ;
end proc:
for n from 1 do
    print(n, A249599(n)) ;
end do: # R. J. Mathar, Nov 11 2014

Crossrefs

Cf. A094676, A249596, A249597, A249598.

Sequence in context: A307930 A289703 A266824 * A364483 A281821 A003773

Adjacent sequences: A249596 A249597 A249598 * A249600 A249601 A249602

Keyword

nonn,base

Author

R. J. Mathar, Mar 30 2009

Extensions

a(6)-a(18) from Lars Blomberg, Feb 05 2015

Status

approved