A261439 Sum of the digits of n exceeds the sum of the digits of n^4.

124499, 1244990, 12449900, 124499000, 594959999, 1244990000, 1349969999, 5949599990, 12449900000, 13499699990, 59495999900

Offset: 1

Author

Jeppe Stig Nielsen, Aug 18 2015

Keywords

• nonn
• base
• more

Comments

A comment by M. F. Hasler in A122484 shows that there are infinitely many terms not divisible by 10.

Crossrefs

A122484 is the main sequence.

Cf. A064209, A064399, A064210, A007953.

Programs

PARI

is(n)=sumdigits(n)>sumdigits(n^4) \\ Charles R Greathouse IV, Aug 18 2015

Python

from itertools import count, islice
def A261439_gen(startvalue=1): # generator of terms >= startvalue
    return filter(lambda n: sum(int(d) for d in str(n)) > sum(int(d) for d in str(n**4)), count(max(startvalue,1)))
A261439_list = list(islice(A261439_gen(),3)) # Chai Wah Wu, Oct 20 2023