id:A089952 - OEIS Search Results

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n+1 and phi(n)+1 are both perfect squares.

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15, 24, 35, 143, 168, 323, 575, 675, 728, 899, 1599, 1763, 2600, 3599, 3720, 5183, 5775, 10403, 11663, 19043, 19320, 21315, 22499, 29928, 32399, 36863, 38024, 39203, 47523, 51528, 51983, 54288, 57599, 67080, 72899, 79523, 93635, 97343 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Select[Range[10^5], IntegerQ[Sqrt[ # + 1]] && IntegerQ[Sqrt[EulerPhi[ # ] + 1]] &]`
	CROSSREFS	`Sequence in context: A035408 A081829 A079721 this_sequence A162964 A067343 A154150` `Adjacent sequences: A089949 A089950 A089951 this_sequence A089953 A089954 A089955`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 17 2004`

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

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