|
Search: id:A162658
|
|
|
| A162658 |
|
Primes such that the sum of its smallest digit and the largest digit is also a prime. |
|
+0
2
|
|
| 23, 29, 41, 47, 61, 67, 83, 103, 107, 163, 211, 223, 229, 233, 241, 269, 293, 307, 383, 421, 431, 433, 443, 449, 457, 461, 467, 479, 491, 499, 503, 509, 523, 547, 587, 607, 613, 631, 641, 661, 677, 701, 829, 853, 857, 863, 883, 929, 947
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
The smallest and the largest digit must be distinct - that is primes like 11 are ignored. Single digit primes are ignored. If there is more than one occurrence of the smallest or the largest digit, only one is counted.
|
|
LINKS
|
Chris Caldwell, The First 1,000 Primes
|
|
EXAMPLE
|
947 is a prime in which the sum of the smallest digit (4) and the largest digit (9) is a prime.
|
|
CROSSREFS
|
A046704, A070027, A086244, A088136, A091939, A109981
Sequence in context: A144226 A094383 A050207 this_sequence A007637 A161723 A085448
Adjacent sequences: A162655 A162656 A162657 this_sequence A162659 A162660 A162661
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jul 09 2009
|
|
|
Search completed in 0.002 seconds
|
