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A352181 a(n) = A200993(n)/2. 2
0, 5, 495, 48510, 4753490, 465793515, 45643010985, 4472549283020, 438264186724980, 42945417749765025, 4208212675290247475, 412361896760694487530, 40407257669872769530470, 3959498889750770719498535, 387990483937905657741325965, 38019107927025003687930446040 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Also a(n) = A200994(n)/3.

Halves of triangular numbers which are also thirds of triangular numbers.

LINKS

Table of n, a(n) for n=0..15.

Editors, L'Intermédiaire des Mathématiciens, Query 4500: The equation x(x+1)/2 = y*(y+1)/3, L'Intermédiaire des Mathématiciens, 22 (1915), 255-260 (I).

Editors, L'Intermédiaire des Mathématiciens, Query 4500: The equation x(x+1)/2 = y*(y+1)/3, L'Intermédiaire des Mathématiciens, 22 (1915), 255-260 (II).

Editors, L'Intermédiaire des Mathématiciens, Query 4500: The equation x(x+1)/2 = y*(y+1)/3, L'Intermédiaire des Mathématiciens, 22 (1915), 255-260 (III).

Editors, L'Intermédiaire des Mathématiciens, Query 4500: The equation x(x+1)/2 = y*(y+1)/3, L'Intermédiaire des Mathématiciens, 22 (1915), 255-260 (IV).

CROSSREFS

Cf. A200993, A200994.

Sequence in context: A160363 A268113 A308132 * A152513 A012822 A124358

Adjacent sequences: A352178 A352179 A352180 * A352182 A352183 A352184

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 08 2022

STATUS

approved

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Last modified January 28 12:02 EST 2023. Contains 359867 sequences. (Running on oeis4.)