id:A063534 - OEIS Search Results

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C(n)=H(n)+d(n), where C(n) is Chowla's function A048050, H(n) is the half-totient function A023022 and d(n) is the number of divisors function A000005.

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6, 8, 15, 21, 33, 39, 51, 57, 69, 87, 93, 111, 123, 129, 141, 159, 177, 183, 201, 213, 219, 237, 249, 267, 291, 303, 309, 321, 327, 339, 381, 393, 411, 417, 447, 453, 471, 489, 501, 519, 537, 543, 573, 579, 591, 597, 633, 669, 681, 687, 699, 717, 723, 753 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) C(n)=sigma(n)-n-1; H(n)=eulerphi(n)/2; j=[]; for(n=1, 1200, if(C(n)==H(n)+numdiv(n), j=concat(j, n))); j`
	CROSSREFS	`Cf. A048050, A023022, A000005.` `Sequence in context: A066160 A100914 A076672 this_sequence A022320 A100646 A074838` `Adjacent sequences: A063531 A063532 A063533 this_sequence A063535 A063536 A063537`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Aug 02 2001`

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Last modified August 28 19:25 EDT 2008. Contains 143183 sequences.

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