|
| |
|
|
A065437
|
|
Smallest base relative to which the n-th prime is palindromic.
|
|
0
| |
|
|
3, 2, 2, 2, 10, 3, 2, 18, 3, 4, 2, 6, 5, 6, 46, 52, 4, 6, 5, 7, 2, 78, 5, 8, 8, 10, 102, 2, 5, 8, 2, 10, 136, 138, 148, 3, 7, 162, 166, 3, 178, 10, 6, 12, 6, 11, 8, 222, 8, 12, 3, 14, 12, 8, 2, 262, 268, 7, 11, 14, 282, 292, 7, 310, 2, 316, 15, 9, 346, 8, 10, 358, 366, 4, 13, 10, 388
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Subset of A016026 for primes only.
|
|
|
LINKS
| Eric Weisstein's World of Mathematics, Palindromic Primes
|
|
|
EXAMPLE
| 71 is the 20-th prime and can be written as 131 in base 7, hence a(20)=7
|
|
|
MATHEMATICA
| PrimeMinBase[ n_ ] := NestWhile[ # + 1 &, 2, IntegerDigits[ Prime[ n ], # ] != Reverse[ IntegerDigits[ Prime[ n ], # ] ] & ]
|
|
|
CROSSREFS
| Cf. A016026.
Sequence in context: A134653 A090207 A202538 * A097721 A073756 A006379
Adjacent sequences: A065434 A065435 A065436 * A065438 A065439 A065440
|
|
|
KEYWORD
| base,easy,nonn
|
|
|
AUTHOR
| Peter Bertok (peter(AT)bertok.com), Nov 23 2001
|
| |
|
|
