id:A057531 - OEIS Search Results

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Numbers n such that sum of digits of n equals the numbers of divisors of n.

+0
9

1, 2, 11, 22, 36, 84, 101, 152, 156, 170, 202, 208, 225, 228, 288, 301, 372, 396, 441, 444, 468, 516, 525, 530, 602, 684, 710, 732, 804, 828, 882, 952, 972, 1003, 1016, 1034, 1070, 1072, 1106, 1111, 1164, 1236, 1304, 1308, 1425, 1472, 1476, 1521, 1524 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`[A007953(n)/A000005(n) = c] AND [A000005(n)/A007953(n) = c], c an integer. [From Ctibor O. Zizka (c.zizka(AT)email.cz), Jun 26 2009]`
	EXAMPLE	`36 is a member as the sum of the digits of 36 is 3+6 = 9 and the number of divisors = 9.`
	MATHEMATICA	`Select[ Range[ 1000 ], DivisorSigma[ 0, # ]==Plus@@IntegerDigits[ # ]& ] (from Harvey Dale)`
	CROSSREFS	`Cf. A000005, A007953, A057532.` `Sequence in context: A076206 A018563 A018590 this_sequence A018661 A018711 A018737` `Adjacent sequences: A057528 A057529 A057530 this_sequence A057532 A057533 A057534`
	KEYWORD	`nonn,easy,base`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Sep 03 2000`

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Last modified March 19 01:26 EDT 2010. Contains 173632 sequences.

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