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Revision History for A381464

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Showing entries 1-10 | older changes
Lexicographically earliest positive integer sequence satisfying a(n) = a(a(n))/n.
(history; published version)
#42 by OEIS Server at Mon Mar 03 13:27:25 EST 2025
LINKS

Thomas Scheuerle, <a href="/A381464/b381464_1.txt">Table of n, a(n) for n = 1..5000</a>

#41 by N. J. A. Sloane at Mon Mar 03 13:27:25 EST 2025
STATUS

proposed

approved

Discussion
Mon Mar 03
13:27
OEIS Server: Installed first b-file as b381464.txt.
#40 by Thomas Scheuerle at Mon Mar 03 01:20:16 EST 2025
STATUS

editing

proposed

#39 by Thomas Scheuerle at Mon Mar 03 01:19:29 EST 2025
LINKS

Thomas Scheuerle, <a href="/A381464/b381464_1.txt">Table of n, a(n) for n = 1..5000</a>

STATUS

approved

editing

#38 by N. J. A. Sloane at Sun Mar 02 23:52:21 EST 2025
STATUS

proposed

approved

#37 by Robert C. Lyons at Tue Feb 25 16:33:09 EST 2025
STATUS

editing

proposed

#36 by Robert C. Lyons at Tue Feb 25 16:33:02 EST 2025
COMMENTS

The greatest common divisor of two consecutive Fibonacci numbers is 1, thus we know that (k-1)^F(m)*k^F(m+1) and (t-1)^F(n)*t^F(n+1) are all different for some m,n > 1 if k and t are chosen such that for m or n < 2 no solution for (k-1)^F(m)*k^F(m+1) = (t-1)^F(n)*t^F(n+1) exist, because this can not cannot be equal if (k-1)*k and (t-1)*t have different prime numbers as divisors and if the only difference is the exponent of the prime factors, then the distribution of these between (t-1) and t and thus their progression F(n) or F(n+1) is individually distinct. In this sequence we need also to consider the more general case (k-c)^F(m)*k^F(m+1) = (t-1)^F(n)*t^F(n+1) because sometimes we need to set a(k) = k+c. It is conjectured that in this case c is bounded to be < 3.

STATUS

proposed

editing

#35 by Thomas Scheuerle at Tue Feb 25 16:08:31 EST 2025
STATUS

editing

proposed

#34 by Thomas Scheuerle at Tue Feb 25 16:07:42 EST 2025
COMMENTS

The greatest common divisor of two consecutive Fibonacci numbers is 1, thus we know that (k-1)^F(m)*k^F(m+1) and (t-1)^F(n)*t^F(n+1) are all different for some m,n > 1 if k and t are chosen such that for m or n < 2 no solution for (k-1)^F(m)*k^F(m+1) = (t-1)^F(n)*t^F(n+1) exist, because this can not be equal if (k-1)*k and (t-1)*t have different prime numbers as divisors and if the only difference is the exponent of the prime factors, then the distribution of these between (t-1) and t and thus their progression F(n) or F(n+1) is individually distinct. In this sequence we need also to consider the more general case (k-c)^F(m)*k^F(m+1) = (t-1)^F(n)*t^F(n+1) because sometimes we need to set a(k) = k+c. It is conjectured that in this case c is bounded to be < 3 by the known growth of this sequence.

#33 by Thomas Scheuerle at Tue Feb 25 16:05:22 EST 2025
COMMENTS

The greatest common divisor of two consecutive Fibonacci numbers is 1, thus we know that (k-1)^F(m)*k^F(m+1) and (t-1)^F(n)*t^F(n+1) are all different for some m,n > 1 if k and t are chosen such that for m or n < 2 no solution for (k-1)^F(m)*k^F(m+1) = (t-1)^F(n)*t^F(n+1) exist. Obviously , because this will can not be equal if (k-1)*k and (t-1)*t have different prime numbers as divisors. If and if the only difference is the exponent of the prime factors, then the distribution of these between (t-1) and t and thus their progression F(n) or F(n+1) is individually distinct. In this sequence we need also to consider the more general case (k-c)^F(m)*k^F(m+1) = (t-1)^F(n)*t^F(n+1) because sometimes we need to set a(k) = k+c. It is conjectured that in this case c is bounded to be < 3 by the known growth of this sequence.