id:A063480 - OEIS Search Results

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C(n+3)=2*C(n), where C(n) is Cototient(n) := n - phi(n) (A051953).

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39, 55, 111, 183, 219, 459, 471, 579, 831, 867, 939, 1191, 1263, 1371, 1623, 1839, 1983, 2019, 2199, 2271, 2631, 2991, 3279, 3459, 3603, 3639, 3711, 3963, 4143, 4359, 4863, 4947, 4971, 5259, 5619, 5799, 5979, 6051, 6411, 7023, 7107, 7419, 7671, 7779 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`C(39) = 15, C(39+3) = 2*15.`
	PROGRAM	`(PARI) C(n)=n-eulerphi(n); j=[]; for(n=1, 20000, if(C(n+3)==2*C(n), j=concat(j, n))); j`
	CROSSREFS	`Cf. A059153.` `Sequence in context: A070145 A133676 A013658 this_sequence A009633 A116281 A050780` `Adjacent sequences: A063477 A063478 A063479 this_sequence A063481 A063482 A063483`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 28 2001`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

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