id:A045502 - OEIS Search Results

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2n+1 and 3n+1 are squares.

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0, 40, 3960, 388080, 38027920, 3726348120, 365144087880, 35780394264160, 3506113493799840, 343563341998120200, 33665701402321979800, 3298895174085555900240, 323258061358982156243760 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`R. S. Luthar, Problem E2606, Amer. Math. Monthly, 84 (1977), 823-824.`
	MATHEMATICA	`f[ 0 ]=0; f[ 1 ]=2; f[ n_ ] := f[ n ]=10f[ n-1 ]-f[ n-2 ]; a[ n_ ] := f[ n ]f[ n+1 ]`
	CROSSREFS	`Cf. A001078.` `Sequence in context: A003741 A049215 A059948 this_sequence A123810 A119525 A123381` `Adjacent sequences: A045499 A045500 A045501 this_sequence A045503 A045504 A045505`
	KEYWORD	`nonn,easy`
	AUTHOR	`Fred Schwab (fschwab(AT)nrao.edu)`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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