id:A035480 - OEIS Search Results

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Pseudoperfect numbers (A005835) that are not Practical (A007620).

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102, 114, 138, 174, 186, 222, 246, 258, 282, 318, 350, 354, 366, 372, 402, 426, 438, 444, 474, 490, 492, 498, 516, 534, 550, 564, 572, 582, 606, 618, 636, 642, 650, 654, 678, 708, 732, 738, 748, 762, 770, 774, 786, 804, 822, 834, 846, 852, 876, 894, 906, 910, 940, 942, 945, 948, 954, 978, 996, 1002 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Cases[ A005835, q_/; (Count[ CoefficientList[ Series[ Times@@( (1+z^#)& /@ Divisors[ q ] ), {z, 0, q} ], z ], 0 ]>0) ]`
	CROSSREFS	`Numbers in A005835 but not in A007620. Cf. A007621.` `Sequence in context: A031413 A127665 A097037 this_sequence A107838 A095637 A023059` `Adjacent sequences: A035477 A035478 A035479 this_sequence A035481 A035482 A035483`
	KEYWORD	`nonn`
	AUTHOR	`wouter.meeussen(AT)pandora.be`
	EXTENSIONS	`Corrected by David W. Wilson (davidwwilson(AT)comcast.net).`

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

AT&T Labs Research