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A067778 Numbers n such that gcd(n, numerator(B(2n)) is not squarefree where B(2n) are the Bernoulli numbers. 3

%I

%S 25,49,75,98,121,125,169,175,196,225,242,245,275,289,325,338,343,361,

%T 363,375,392,425,475,484,490,507,525,529,539,575,578,625,637,675,676,

%U 686,722,725,726,775,784,825,833,841,845,847,867,875,925,931,961,968

%N Numbers n such that gcd(n, numerator(B(2n)) is not squarefree where B(2n) are the Bernoulli numbers.

%C All members so far are themselves not squarefree. - _Robert G. Wilson v_, Aug 28 2004

%t Select[ Range[1000], !SquareFreeQ[ GCD[ #, Numerator[ BernoulliB[2# ]] ]] &] (* _Robert G. Wilson v_, Aug 28 2004 *)

%Y Cf. A097704.

%K nonn

%O 1,1

%A _Benoit Cloitre_, Feb 06 2002

%E More terms from _Robert G. Wilson v_, Aug 28 2004

%E 'Needs["NumberTheory`"]' (no longer needed) removed from Mathematica code by _Jean-Fran├žois Alcover_, Dec 04 2013

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Last modified October 28 17:39 EDT 2021. Contains 348329 sequences. (Running on oeis4.)