id:A062784 - OEIS Search Results

Search: id:A062784

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Numbers n such that sigma(n) + phi(n) is a perfect square.

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2, 4, 56, 110, 125, 161, 287, 391, 418, 423, 511, 588, 609, 675, 721, 799, 910, 935, 1048, 1057, 1102, 1130, 1281, 1351, 1457, 1485, 1630, 1716, 1799, 1826, 1921, 2047, 2060, 2177, 2255, 2378, 2403, 2449, 2457, 2472, 3199, 3266, 3915, 4010, 4376, 4417 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) j=[]; for(n=1, 10000, if(issquare(sigma(n)+eulerphi(n)), j=concat(j, n))); j`
	CROSSREFS	`Sequence in context: A121234 A084574 A087621 this_sequence A098626 A012370 A012366` `Adjacent sequences: A062781 A062782 A062783 this_sequence A062785 A062786 A062787`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 18 2001`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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