2,1

B(6), B(16) and B(18) are the first three Bernoulli numbers whose index is equal to their decimal expansion periodic length, B(16) and B(18) being the smallest such pair of consecutive even-indexed Bernoulli numbers.

Table of n, a(n) for n=2..101.

54.9711779448621553884711779448621553884...

RealDigits[BernoulliB[18], 10, 100] // First

Cf. A021046 (B(6)), A234355 (B(16)).

Sequence in context: A332794 A054508 A110617 * A338502 A102081 A068397

Adjacent sequences: A234353 A234354 A234355 * A234357 A234358 A234359

nonn,cons

Jean-François Alcover and Paul Curtz, Dec 24 2013

approved