Genocchi number

Genocchi number

The Genocchi numbers, named after Angelo Genocchi, are a sequence of integers, G"n" that satisfy the relation

:frac{2t}{e^t+1}=sum_{n=1}^{infty} G_nfrac{t^n}{n!}.

The first few Genocchi numbers are 1, -1, 0, 1, 0, -3, 0, 17 OEIS|id=A001469. G"n" is 0 for odd "n" > 1.

It has been proven that -3 and 17 are the only prime Genocchi numbers.

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