id:A068367 - OEIS Search Results

Search: id:A068367

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Numbers n such that phi(n)^2+sigma(n)^2 is prime.

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1, 4, 8, 25, 50, 121, 225, 324, 400, 800, 1024, 1250, 1681, 1682, 2025, 2209, 4761, 5041, 5625, 6561, 6724, 7569, 11449, 17424, 18225, 18769, 21609, 26244, 34969, 36481, 38809, 42050, 59858, 62001, 72900, 90000, 102152, 108900 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A066631 A090896 A131637 this_sequence A000964 A107840 A046736` `Adjacent sequences: A068364 A068365 A068366 this_sequence A068368 A068369 A068370`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 28 2002`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research