id:A055859 - OEIS Search Results

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a(n) and floor[a(n)/7] are both squares; i.e. squares which remain squares when written in base 7 and last digit is removed.

+0
2

0, 1, 4, 9, 64, 256, 2025, 16129, 64516, 514089, 4096576, 16386304, 130576329, 1040514049 (list; graph; listen)

	OFFSET	`0,3`
	EXAMPLE	`a(5) = 256 because 256 = 16^2 = 514 base 7 and 51 base 7 = 36 = 6^2`
	CROSSREFS	`Cf. A023110.` `Sequence in context: A062067 A110256 A095175 this_sequence A162991 A062926 A069020` `Adjacent sequences: A055856 A055857 A055858 this_sequence A055860 A055861 A055862`
	KEYWORD	`base,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jul 14 2000`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.