A073873 - OEIS

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A073873

Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.

1, 45, 325, 1225, 1653, 2145, 3321, 3655, 4371, 7381, 8911, 11781, 14365, 17205, 20301, 21945, 23653, 25425, 32131, 34191, 41905, 44253, 45451, 46665, 47895, 54285, 55611, 59685, 65341, 68265, 72771, 74305, 77421, 87153, 97461, 110215

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OFFSET

1,2

COMMENTS

Is n^2*(n^2+1)/2 in the sequence for infinitely many odd numbers n? For almost all odd n? It's in the sequence for n up to 99, except for 39, 65 and 67.

LINKS

Table of n, a(n) for n=1..36.

CROSSREFS

Cf. A073872, A073874.

Sequence in context: A341568 A093761 A324458 * A272850 A129153 A156719

Adjacent sequences: A073870 A073871 A073872 * A073874 A073875 A073876

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Aug 16 2002

EXTENSIONS

Edited by Dean Hickerson, Oct 15 2002

STATUS

approved