The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A051154 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A051154

a(n) = 1 + 2^k + 4^k where k = 3^n.
(history; published version)

#40 by Alois P. Heinz at Fri Jul 07 18:56:17 EDT 2023

STATUS

editing

approved

#39 by Alois P. Heinz at Fri Jul 07 18:56:13 EDT 2023

MAPLE

with(numtheory); F := proc(n, r) local p; p := ithprime(r); (2^(p^(n+1))-1)/(2^(p^n)-1); end; [ seq(F(n, 2), n=0..5) ]; :

[ seq(F(n, 2), n=0..5) ];

STATUS

approved

editing

#38 by Alois P. Heinz at Fri Jul 07 18:47:21 EDT 2023

STATUS

proposed

approved

#37 by Dario Alpern at Fri Jul 07 18:46:48 EDT 2023

STATUS

editing

proposed

#36 by Dario Alpern at Fri Jul 07 18:46:19 EDT 2023

LINKS

D. Dario Alpern, <a href="https://www.alpertron.com.ar/MODFERM.HTM">Factors of Generalized Fermat Numbers</a>

Discussion

Fri Jul 07

18:46

Dario Alpern: Fixed link

#35 by Dario Alpern at Fri Jul 07 18:45:42 EDT 2023

LINKS

D. Alpern, <a href="httphttps://www.alpertron.com.ar/MODFERM.HTM">Factors of Generalized Fermat Numbers</a>

Solomon W. Golomb, <a href="httphttps://www.jstor.org/stable/2321679">Cyclotomic polynomials and factorization theorems</a>, Amer. Math. Monthly 85 (1978), 734-737.

STATUS

approved

editing

#34 by Amiram Eldar at Sat Aug 22 14:16:27 EDT 2020

STATUS

reviewed

approved

#33 by Michel Marcus at Wed Aug 19 10:09:17 EDT 2020

STATUS

proposed

reviewed

Discussion

Wed Aug 19

11:05

Jeppe Stig Nielsen: Thank you for correcting that. What is the largest number that can be put in the Data section (I know the total character count should not exceed 260)?

Sat Aug 22

14:16

Amiram Eldar: The DATA should be about ~260 characters so it will take about 3 1/2 lines. So, there is no definite answer to your question, since it depends on the number of digits of the other terms.

#32 by David A. Corneth at Wed Aug 19 09:52:28 EDT 2020

STATUS

editing

proposed

Discussion

Wed Aug 19

09:52

David A. Corneth: Let's say that in a comment. I've seen more such arround OEIS.

#31 by David A. Corneth at Wed Aug 19 09:52:22 EDT 2020

COMMENTS

The next term, a(5) has 147 digits and is too large to include in DATA. - David A. Corneth, Aug 19 2020

STATUS

proposed

editing