id:A062317 - OEIS Search Results

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Numbers n such that 5n-1 is a perfect square.

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1, 2, 10, 13, 29, 34, 58, 65, 97, 106, 146, 157, 205, 218, 274, 289, 353, 370, 442, 461, 541, 562, 650, 673, 769, 794, 898, 925, 1037, 1066, 1186, 1217, 1345, 1378, 1514, 1549, 1693, 1730, 1882, 1921, 2081, 2122, 2290, 2333, 2509, 2554, 2738, 2785, 2977 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=((2+5n)^2+1)/5 if n is odd; a(n)=((3+5n)^2+1)/5 if n is even`
	PROGRAM	`(PARI) je=[]; for(n=1, 5000, if(issquare(5*n-1), je=concat(je, n))); je`
	CROSSREFS	`Cf. A036666.` `Sequence in context: A045218 A058216 A037386 this_sequence A140510 A098735 A050546` `Adjacent sequences: A062314 A062315 A062316 this_sequence A062318 A062319 A062320`
	KEYWORD	`nonn`
	AUTHOR	`Santi Spadaro (spados(AT)katamail.com), Jul 12 2001`
	EXTENSIONS	`More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jul 14 2001`

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Last modified September 6 00:03 EDT 2008. Contains 143485 sequences.

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