1,1

Table of n, a(n) for n=1..88.

a(3)=5, since binomial(3+5,5) mod 5 = 56 mod 5 = 1 and 5 is the minimal odd number with this property.

a(8)=9 because of binomial(8+9,9)=24310=2701*9+1, but binomial(8+k,k) mod k<>1 for all odd numbers <9.

Cf. A000040, A133620, A133621, A133623, A133630, A133635.

Cf. A133872, A133880, A133890, A133900, A133910.

Sequence in context: A061794 A088524 A129337 * A177691 A206913 A117767

Adjacent sequences: A133906 A133907 A133908 * A133910 A133911 A133912

nonn

Hieronymus Fischer, Oct 20 2007

approved