login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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)

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 *)

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 3 22:17 EDT 2022. Contains 357237 sequences. (Running on oeis4.)