|
Search: id:A155056
|
|
|
| A155056 |
|
Primes n such that number of prime digits of prime(n) > number of nonprime digits of prime(n). |
|
+0
1
|
|
| 2, 3, 31, 37, 59, 61, 67, 71, 73, 101, 103, 107, 131, 137, 139, 151, 241, 307, 331, 349, 367, 457, 461, 491, 499, 503, 509, 521, 587, 727, 733, 739, 823, 827
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Prime digit = 2, 3, 5 or 7. Nonprime digit = 0, 1, 4, 6, 8 or 9.
|
|
EXAMPLE
|
If n=31=prime and 127=prime(31), then 1(1)<2(2 and 7) and 31=a(3). if n=37=prime and 157=prime(37), then 1(1)<2(5 and 7) and 37=a(4). If n=59=prime and 277=prime(59), then 0<3(2, 7 and 7) and 59=a(5), etc.
|
|
CROSSREFS
|
Cf. A000040, A141468.
Sequence in context: A143665 A074479 A136150 this_sequence A110456 A128348 A029973
Adjacent sequences: A155053 A155054 A155055 this_sequence A155057 A155058 A155059
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 19 2009
|
|
|
Search completed in 0.002 seconds
|
