The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A361491 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A361491

Expansion of x*(1+38*x+x^2)/((1-x)*(x^2-34*x+1)).
(history; published version)

#15 by Michael De Vlieger at Mon Jun 10 08:53:11 EDT 2024

STATUS

proposed

approved

#14 by Michel Marcus at Mon Jun 10 01:35:56 EDT 2024

STATUS

editing

proposed

#13 by Michel Marcus at Mon Jun 10 01:35:53 EDT 2024

FORMULA

a(n) = 35*a(n-1) -35*a(n-2) +a(n-3).

STATUS

proposed

editing

#12 by Jon E. Schoenfield at Mon Jun 10 00:15:32 EDT 2024

STATUS

editing

proposed

#11 by Jon E. Schoenfield at Mon Jun 10 00:15:30 EDT 2024

COMMENTS

Indices i of Tetrahedral Numbers T(i) such that T(i)*T(2*i) is a perfect square. [Ulas].

FORMULA

4*a(n) = -5+9*( A029547(n)-33*A029547(n-1)).

STATUS

approved

editing

#10 by OEIS Server at Thu Jan 18 09:59:32 EST 2024

LINKS

Paolo Xausa, <a href="/A361491/b361491_1.txt">Table of n, a(n) for n = 1..500</a>

#9 by Michael De Vlieger at Thu Jan 18 09:59:32 EST 2024

STATUS

proposed

approved

Discussion

Thu Jan 18

09:59

OEIS Server: Installed first b-file as b361491.txt.

#8 by Michel Marcus at Thu Jan 18 08:59:06 EST 2024

STATUS

editing

proposed

#7 by Michel Marcus at Thu Jan 18 08:59:02 EST 2024

LINKS

Maciej Ulas, <a href="https://arxiv.org/abs/0811.2477">On certain diophantine equations related to triangular and tetrahedral numbers</a>, arXiv:0811.2477 [math.NT] (2008) , u_n in Theorem 5.6.

STATUS

proposed

editing

#6 by Paolo Xausa at Thu Jan 18 08:55:07 EST 2024

STATUS

editing

proposed