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!)
A217532 Numbers k such that sum of 4th power of digits of k equals the sum of prime divisors of k. 1

%I #6 Jan 20 2024 15:15:54

%S 210,1210,2100,12100,21000,21021,36522,63141,89195,92029,112132,

%T 116010,118461,121000,149851,203013,203202,210000,214456,303142,

%U 304341,313230,323723,331401,351760,416213,441532,524371,534656,574915,610171,654560,897648,999643

%N Numbers k such that sum of 4th power of digits of k equals the sum of prime divisors of k.

%C Numbers k such that A055013(k) = A008472(k).

%e 210 = 2*3*5*7 is in the sequence because 2^4 + 1^4 + 0^4 = 2 + 3 + 5 + 7 = 17.

%t Rest[Select[Range[1000000], Total[Transpose[FactorInteger[#]][[1]]]==Total[IntegerDigits[#]^4]&]]

%Y Cf. A055013, A008472.

%K nonn,easy,base

%O 1,1

%A _Michel Lagneau_, Oct 05 2012

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 September 14 03:52 EDT 2024. Contains 375911 sequences. (Running on oeis4.)