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A276782 Where record values occur in A276781. 2
2, 6, 15, 22, 36, 58, 95, 96, 147, 148, 209, 210, 305, 306, 901, 902, 903, 904, 905, 906, 1149, 1150, 1353, 1354, 1355, 1356, 1357, 1358, 1359, 1360, 5621, 5622, 8499, 8500, 9585, 9586, 15719, 15720, 15721, 15722, 15723, 15724, 15725, 15726, 19653, 19654, 19655, 19656, 19657, 19658, 19659, 19660, 31449 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..72

Christophe Soulé, Le triangle de Pascal et ses propriétés, Lecture, Soc. Math. de France, Feb 13 2008.

MAPLE

A276781 := proc(n)

    local b, k;

    for b from 0 to floor(n/2+1) do

        igcd(seq(binomial(n, k), k=b..n-b)) ;

        if % > 1 then

            return b ;

        end if;

    end do:

end proc:

am := -1 ;

for n from 2 do

    an := A276781(n) ;

    if an > am then

        printf("%d, \n", n) ;

        am := an ;

    end if;

end do: # R. J. Mathar, Sep 30 2016

MATHEMATICA

Function[t, First@ Position[t, #] & /@ Range@ Max@ t][{0}~Join~Table[b = 1; While[GCD @@ Map[Binomial[n, #] &, Range[b, n - b]] == 1, b++]; b, {n, 2, 1500}]] // Flatten (* Michael De Vlieger, Oct 03 2016 *)

CROSSREFS

Cf. A276781.

Sequence in context: A014847 A013636 A144653 * A227210 A177442 A090979

Adjacent sequences:  A276779 A276780 A276781 * A276783 A276784 A276785

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 29 2016

EXTENSIONS

a(11)-a(30) from R. J. Mathar, Sep 30 2016

More terms from Chai Wah Wu, Oct 02 2016

STATUS

approved

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Last modified May 19 22:56 EDT 2019. Contains 323411 sequences. (Running on oeis4.)