|
Search: id:A024770
|
|
|
| A024770 |
|
Right-truncatable primes: every prefix is prime. |
|
+0
19
|
|
| 2, 3, 5, 7, 23, 29, 31, 37, 53, 59, 71, 73, 79, 233, 239, 293, 311, 313, 317, 373, 379, 593, 599, 719, 733, 739, 797, 2333, 2339, 2393, 2399, 2939, 3119, 3137, 3733, 3739, 3793, 3797, 5939, 7193, 7331, 7333, 7393, 23333, 23339, 23399, 23993, 29399, 31193, 31379
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Primes in which repeatedly deleting the least significant digit gives a prime at every step until a single digit prime remains.
Comment from Alexander R. Povolotsky (pevnev(AT)juno.com), Jan 22 2008: The subsequence which consists of the following "chain" of consecutive right truncatable primes:
73939133 , 7393913 , 739391 , 73939 , 7393 , 739 , 73 , (7)
yields the largest sum, compared with other chains formed from subsets of this sequence:
73939133 + 7393913 + 739391 + 73939 + 7393 + 739 + 73 (+ 7) = 82154588
|
|
LINKS
|
Jens Kruse Andersen, Table of n, a(n) for n = 1..83 (The full list of terms, taken from link below)
Jens Kruse Andersen, Right-truncatable primes
P. De Geest, The list of 4260 left-truncatable primes
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
|
|
CROSSREFS
|
Cf. A033664, A024785 (left-trucatable primes), A032437, A020994, A052023, A052024, A052025, A050986, A050987.
Cf. A069866.
Adjacent sequences: A024767 A024768 A024769 this_sequence A024771 A024772 A024773
Sequence in context: A124673 A024776 A069867 this_sequence A038603 A106116 A091727
|
|
KEYWORD
|
nonn,base,fini,nice
|
|
AUTHOR
|
David W. Wilson (davidwwilson(AT)comcast.net)
|
|
EXTENSIONS
|
Ends at a(83) = 73939133
|
|
|
Search completed in 0.002 seconds
|
