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A073589
a(n)=a(n-1)^2*2^n-1 where a(0)=1.
0
1, 1, 3, 71, 80655, 208167328799, 2773352753875902386073663, 984510143671174604457027747023105816438433566408831, 248130617085807836435043583698283293120315590212520216226461514224419945596690035680296658588117705359615
OFFSET
0,3
COMMENTS
The next term has 212 digits. - Harvey P. Dale, Dec 05 2018
MATHEMATICA
RecurrenceTable[{a[0]==1, a[n]==a[n-1]^2 2^n-1}, a, {n, 9}] (* Harvey P. Dale, Dec 05 2018 *)
PROG
(BASIC)
20 A=1
25 print A
30 for I=1 to 20
40 A=(A^2)*2^I-1
50 print A
60 next
70 end
(PARI) lista(nn) = {my(v = 1); print1(v, ", "); for (n=1, nn, v = v^2*2^n-1; print1(v, ", "); ); } \\ Michel Marcus, Sep 28 2013
CROSSREFS
Sequence in context: A300540 A334124 A336441 * A089537 A321530 A374898
KEYWORD
easy,nonn
AUTHOR
Felice Russo, Aug 28 2002
EXTENSIONS
a(0)=1 prepended by Michel Marcus, Sep 28 2013
STATUS
approved