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A135554 Numbers n such that n is the fourth power of an integer and the sum of digits of n is prime. 2
16, 256, 625, 2401, 4096, 83521, 160000, 279841, 456976, 1048576, 1500625, 2560000, 2825761, 3748096, 4477456, 4879681, 5764801, 6250000, 7890481, 9834496, 11316496, 14776336, 16777216, 20151121, 21381376, 24010000, 28398241 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Intersection of A000583 and A028834. - Michel Marcus, Oct 19 2016
LINKS
EXAMPLE
a(1)=16 because 2^4=16 and 1+6=7, prime.
MATHEMATICA
Select[Range[80]^4, PrimeQ[Total[IntegerDigits[#]]]&] (* Harvey P. Dale, Dec. 13, 2010 *)
PROG
(PARI) isok(n) = ispower(n, 4) && isprime(sumdigits(n)); \\ Michel Marcus, Oct 19 2016
CROSSREFS
Sequence in context: A208071 A206984 A207842 * A208376 A208066 A207931
KEYWORD
easy,nonn,base
AUTHOR
Enoch Haga, Nov 25 2007
EXTENSIONS
Description corrected by Harvey P. Dale, Dec 13 2010
STATUS
approved

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Last modified May 24 08:42 EDT 2024. Contains 372773 sequences. (Running on oeis4.)