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A178424 17 followed by the base-18 Fermat numbers. 0
17, 19, 325, 104977, 11019960577, 121439531096594251777, 14747559712960682275277163588165279154177, 217490517487340961382742893166950969620647214876916403331613367885781133978238 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..7.

FORMULA

a(n)= 18^(2^(n-1))+1, n>0.

a(n)= 2+ product_{i<n} a(i).

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

MATHEMATICA

Clear[a, n];

a[0] := 17;

a[n_] := a[n] = Product[a[i], {i, 0, n - 1}] + 2;

Table[a[n], {n, 0, 10}]

CROSSREFS

Cf. A000215

Sequence in context: A132242 A162873 A174379 * A068387 A134539 A196571

Adjacent sequences:  A178421 A178422 A178423 * A178425 A178426 A178427

KEYWORD

nonn,easy

AUTHOR

Roger L. Bagula, May 27 2010

EXTENSIONS

Edited by the Assoc. Eds. of the OEIS, Jul 20 2010

STATUS

approved

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Last modified July 8 08:08 EDT 2020. Contains 335520 sequences. (Running on oeis4.)