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A089146 Greatest common divisor of n^2-4 and n^2+4. +0
1
4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4, 1, 8, 1, 4 (list; graph; listen)
OFFSET

0,1

COMMENT

Also decimal expansion of 4181/9999 = .418141814181..

Multiplicative with a(2) = 8, a(2^e) = 4 if e >= 2, a(p^e) = 1 otherwise. David W. Wilson (davidwwilson(AT)comcast.net) Jun 12, 2005.

PROGRAM

(PARI) g(n) = for(x=0, n, print1(gcd(x^2-4, x^2+4)", "))

CROSSREFS

Sequence in context: A139045 A084884 A143320 this_sequence A101512 A085994 A040019

Adjacent sequences: A089143 A089144 A089145 this_sequence A089147 A089148 A089149

KEYWORD

easy,nonn,mult

AUTHOR

Cino Hilliard (hillcino368(AT)gmail.com), Dec 05 2003

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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