The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A216538

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A216538

Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 7*b^2.
(history; published version)

#12 by N. J. A. Sloane at Thu May 02 13:07:21 EDT 2013

NAME

Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 7*b^2.

DATA

2, 8, 11, 13, 31, 41, 47, 61, 79, 313, 617, 863, 1097, 4793, 5851, 7741, 12251, 13963, 35449, 36779, 44507, 89849, 140057, 148091, 202667, 387433, 443609, 574219, 631181, 651821

OFFSET

1,1

LINKS

Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a>

CROSSREFS

Cf. A000032, A001606.

KEYWORD

recycled

nonn

AUTHOR

V. Raman, Sep 08 2012

STATUS

proposed

approved

#11 by V. Raman at Thu May 02 10:22:02 EDT 2013

STATUS

editing

proposed

#10 by V. Raman at Thu May 02 09:56:33 EDT 2013

NAME

Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 7*b^2.

DATA

2, 8, 11, 13, 31, 41, 47, 61, 79, 313, 617, 863, 1097, 4793, 5851, 7741, 12251, 13963, 35449, 36779, 44507, 89849, 140057, 148091, 202667, 387433, 443609, 574219, 631181, 651821

OFFSET

1,1

LINKS

Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a>

CROSSREFS

Cf. A000032, A001606.

KEYWORD

nonn

recycled

AUTHOR

V. Raman, Sep 08 2012

STATUS

approved

editing

#9 by T. D. Noe at Mon Sep 17 11:26:06 EDT 2012

STATUS

editing

approved

#8 by T. D. Noe at Mon Sep 17 11:26:02 EDT 2012

NAME

Numbers n such that the n-th Lucas number is prime, but n cannot be written in the form a^2 + 7*b^2.

STATUS

approved

editing

#7 by T. D. Noe at Thu Sep 13 15:17:04 EDT 2012

STATUS

editing

approved

#6 by T. D. Noe at Thu Sep 13 15:16:59 EDT 2012

NAME

Numbers n such that the n-th Lucas number is prime, but n cannot be written in the form a^2 + 7*b^2.

STATUS

proposed

editing

#5 by V. Raman at Thu Sep 13 14:18:10 EDT 2012

STATUS

editing

proposed

#4 by V. Raman at Thu Sep 13 14:11:55 EDT 2012

NAME

Numbers n such that the n-th Lucas number is prime , but cannot be written in the form a^2+7*b^2.

#3 by V. Raman at Thu Sep 13 13:51:12 EDT 2012

NAME

Prime numbers Numbers n such that the n-th Lucas number is prime but cannot be written in the form a^2+7*b^2, and Lucas(n) is prime.

CROSSREFS

Cf. A000032, A001606.