The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A085104

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A085104

Primes of the form 1 + n + n^2 + n^3 + ... + n^k, n > 1, k > 1.
(history; published version)

#146 by Alois P. Heinz at Sat Aug 24 18:26:22 EDT 2024

STATUS

proposed

approved

#145 by Jason Yuen at Sat Aug 24 15:58:56 EDT 2024

STATUS

editing

proposed

#144 by Jason Yuen at Sat Aug 24 15:58:46 EDT 2024

CROSSREFS

Cf. A003424 (n restricted to prime powers).

STATUS

approved

editing

#143 by Joerg Arndt at Sat Jun 01 10:29:31 EDT 2024

STATUS

reviewed

approved

#142 by Michel Marcus at Sat Jun 01 10:22:41 EDT 2024

STATUS

proposed

reviewed

#141 by Jon E. Schoenfield at Sat Jun 01 10:21:04 EDT 2024

STATUS

editing

proposed

#140 by Jon E. Schoenfield at Sat Jun 01 10:20:59 EDT 2024

COMMENTS

The conjecture proposed in Quadrature "No Sophie Germain prime is Brazilian (prime)" (see link Bernard Schott, Quadrature, Conjecture 1, page 36) is false. Thanks to Giovanni Resta , who has found that a(856) = 28792661 = 1 + 73 + 73^2 + 73^3 + 73^4 = (11111)_73 is the 141385th Sophie Germain prime. - Bernard Schott, Mar 08 2019

STATUS

approved

editing

#139 by Amiram Eldar at Wed Dec 16 12:56:32 EST 2020

STATUS

reviewed

approved

#138 by Michel Marcus at Wed Dec 16 12:51:13 EST 2020

STATUS

proposed

reviewed

#137 by Michel Marcus at Wed Dec 16 11:59:55 EST 2020

STATUS

editing

proposed

Discussion

Wed Dec 16

12:08

Bernard Schott: Ok, thanks!