|
Search: id:A070957
|
|
|
| A070957 |
|
Primes p such that the equation sigma(x)=p has no solution. |
|
+0
1
|
|
| 2, 5, 11, 17, 19, 23, 29, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
PROGRAM
|
(PARI) for(n=1, 100, if(sum(j=1, n, if(sigma(j)-n, 1-isprime(n), 1))==0, print1(n, ", ")))
|
|
CROSSREFS
|
Cf. A007369.
Sequence in context: A118660 A009770 A132121 this_sequence A080165 A063535 A091653
Adjacent sequences: A070954 A070955 A070956 this_sequence A070958 A070959 A070960
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Benoit Cloitre (benoit7848c(AT)orange.fr), May 16 2002
|
|
|
Search completed in 0.002 seconds
|
