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A140432 a(1)=1, a(2)=2, a(3)=3, a(4)=4, a(5)=5, a(n+1)=a(1)*a(2)*...*a(n)-1 for n>=5. 0
1, 2, 3, 4, 5, 119, 14279, 203904119, 41576889949070279, 1728637777837101228675346430208119, 2988188566965591343823377482689473316222062058836342422720083726279 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

a(1)^2 + a(2)^2 + ... + a(70)^2 = a(1)*a(2)*...*a(70)

LINKS

L. Kurlyandchik Problem M1523. Kvant 1995 (6), 23; Solution to M1523. Kvant 1996 (3), 24-25. (in Russian)

FORMULA

For n>=6, a(n) = a(1)^2 + a(2)^2 + ... + a(n-1)^2 - n + 70.

CROSSREFS

Cf. A005267.

Sequence in context: A162225 A010348 A171591 * A004867 A073787 A037436

Adjacent sequences:  A140429 A140430 A140431 * A140433 A140434 A140435

KEYWORD

nonn

AUTHOR

Max Alekseyev (maxale(AT)gmail.com), Jun 19 2008

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Last modified February 16 01:56 EST 2012. Contains 205860 sequences.