The On-Line Encyclopedia of Integer Sequences (OEIS)

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The pairs (x,y) such that x^2 = 1+factorial(y).
(history; published version)

#3 by Russ Cox at Fri Mar 30 18:38:14 EDT 2012

AUTHOR

_Vincenzo Librandi (vincenzo.librandi(AT)tin.it), _, Jul 30 2009

Discussion

Fri Mar 30

18:38

OEIS Server: https://oeis.org/edit/global/215

#2 by Russ Cox at Fri Mar 30 17:40:05 EDT 2012

EXTENSIONS

Reference to main sequence added by _R. J. Mathar (mathar(AT)strw.leidenuniv.nl), _, Aug 02 2009

Discussion

Fri Mar 30

17:40

OEIS Server: https://oeis.org/edit/global/190

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

The pairs (x,y) such that x^2 = 1+factorial(y).

DATA

5, 4, 11, 5, 71, 7

OFFSET

1,1

COMMENTS

The main entry for this relation is the bisection in A146968.

EXAMPLE

71^2 = 7!+1, which introduces (71,7) into the sequence.

KEYWORD

nonn,less

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 30 2009

EXTENSIONS

Reference to main sequence added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 02 2009

STATUS

approved