login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A178427 7 followed by the Fermat numbers A152581. 3
7, 9, 65, 4097, 16777217, 281474976710657, 79228162514264337593543950337, 6277101735386680763835789423207666416102355444464034512897, 394020061963944792122790401001436138050797392704654466679482934042457217714972 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

If a(0)=3, the recursion formula gives A000215.

LINKS

Table of n, a(n) for n=0..8.

FORMULA

a(0)=7. a(n)= 2+product_{i=0..n-1} a(i).

MATHEMATICA

Clear[a, n];

a[0] := 7;

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

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

CROSSREFS

Cf. A000215, A178426, A178428.

Sequence in context: A226197 A263836 A087336 * A285011 A317401 A137058

Adjacent sequences:  A178424 A178425 A178426 * A178428 A178429 A178430

KEYWORD

nonn

AUTHOR

Roger L. Bagula, May 27 2010

EXTENSIONS

Definition simplified by the Assoc. Eds. of the OEIS - May 28 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 5 01:22 EDT 2020. Contains 335457 sequences. (Running on oeis4.)