The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A087578 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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Duplicate of A023195.
(history; published version)

#3 by N. J. A. Sloane at Fri May 11 03:00:00 EDT 2007

NAME

Same as Duplicate of A023195.

#2 by N. J. A. Sloane at Tue Jul 19 03:00:00 EDT 2005

NAME

Primes in 1+ p +p^2 +...+ p^k, where p is a prime.

Same as A023195.

DATA

3, 7, 13, 31, 127, 307, 1093, 1723, 2801, 3541, 5113, 8011, 8191, 10303, 17293, 19531

COMMENTS

A sub sequence of A023195. When n = p^k.

EXAMPLE

1093 is a member. 1093 = 1+3+3^2 ... + 3^6. 2801 is also a member,

2801= 1+7 +7^2 +7^3 +7^4.

CROSSREFS

KEYWORD

more,nonn,new

dead

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 17 2003

#1 by N. J. A. Sloane at Thu Feb 19 03:00:00 EST 2004

NAME

Primes in 1+ p +p^2 +...+ p^k, where p is a prime.

DATA

3, 7, 13, 31, 127, 307, 1093

OFFSET

1,1

COMMENTS

A sub sequence of A023195. When n = p^k.

EXAMPLE

1093 is a member. 1093 = 1+3+3^2 ... + 3^6. 2801 is also a member,

2801= 1+7 +7^2 +7^3 +7^4.

CROSSREFS

KEYWORD

more,nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 17 2003

STATUS

approved