|
Search: id:A071837
|
|
|
| A071837 |
|
Numbers n with property that in prime factorization of n all prime exponents are prime, their sum is also prime and equals the sum of distinct prime factors of n. |
|
+0
1
|
|
| 4, 27, 72, 108, 800, 3125, 12500, 247808, 823543, 37879808, 190512000, 266716800, 428652000, 529200000, 600112800, 1234800000, 1452124800, 2420208000, 2679075000, 3307500000, 7351381800, 7441875000, 7717500000, 9376762500
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
800 is a term as 800=2^5*5^2, 2+5=5+2=7 and 7,5,2 are primes.
|
|
CROSSREFS
|
Cf. A054411, A008472, A001222, A056166, A070215.
Sequence in context: A054412 A122405 A122406 this_sequence A015238 A070600 A100488
Adjacent sequences: A071834 A071835 A071836 this_sequence A071838 A071839 A071840
|
|
KEYWORD
|
nonn,nice
|
|
AUTHOR
|
Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jun 08 2002
|
|
|
Search completed in 0.002 seconds
|
