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 A057531 Numbers whose sum of digits and number of divisors are equal. 18
 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; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS [A007953(n)/A000005(n) = c] AND [A000005(n)/A007953(n) = c], c an integer. - Ctibor O. Zizka, Jun 26 2009 LINKS Giovanni Resta, Table of n, a(n) for n = 1..10000 (first 210 terms from Daniel Arribas) Code Golf StackExchange, Find the nth number where the digit sum equals the number of factors, coding challenge started Nov 28 2022. EXAMPLE 36 is a term as the sum of the digits of 36 is 3+6 = 9 and the number of divisors is 9 too. MATHEMATICA Select[ Range[ 1000 ], DivisorSigma[ 0, # ]==Plus@@IntegerDigits[ # ]& ] (* Harvey P. Dale, Feb 19 2004 *) PROG See the Code Golf link. CROSSREFS Cf. A000005, A007953, A057532, A050689, A070274, A070275, A063737, A067077. Sequence in context: A076206 A018563 A018590 * A018661 A259298 A018711 Adjacent sequences: A057528 A057529 A057530 * A057532 A057533 A057534 KEYWORD nonn,easy,base AUTHOR Asher Auel (asher.auel(AT)reed.edu), Sep 03 2000 STATUS approved

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Last modified September 25 16:39 EDT 2023. Contains 365648 sequences. (Running on oeis4.)