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A123180 Even positions of Sylvester's sequence A000058; the denominators of the (greedy) Egyptian fraction expansion of Cahen's constant. +0
1
2, 7, 1807, 10650056950807 (list; graph; listen)
OFFSET

0,1

REFERENCES

E. Cahen, (1891). "Note sur un developpement des quantites numeriques, qui presente quelque analogie avec celui en fractions continues". Nouvelles Annales de Mathematiques 10: 508-514.

LINKS

Cahen's constant

FORMULA

a(n) = a(n-1)(a(n-1)-1)(a(n-1)(a(n-1)-1)+1)+1

CROSSREFS

Cf. A000058, A006279, A006280, A006281, A118227.

Sequence in context: A082891 A000653 A128847 this_sequence A138198 A106023 A152181

Adjacent sequences: A123177 A123178 A123179 this_sequence A123181 A123182 A123183

KEYWORD

easy,nonn

AUTHOR

David Eppstein (eppstein(AT)ics.uci.edu), Oct 03 2006

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.


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