|
Search: id:A069621
|
|
|
| A069621 |
|
a(1) = 9; a(2n) = smallest prime that is a right concatenation of a(2n-1) and a number with no insignificant zeros and a(2n+1) = smallest prime ending in ( the least significant digits) a(2n). Alternate left and right concatenation yielding primes. |
|
+0
10
|
|
| 9, 97, 197, 1973, 31973, 319733, 3319733, 331973311, 6331973311, 633197331131, 5633197331131, 563319733113127, 6563319733113127, 65633197331131279, 3465633197331131279, 346563319733113127933, 18346563319733113127933
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
a(4) = 1973 staring with a(3) =197 and a(5) = 31973 ending in a(4) = 1973.
|
|
CROSSREFS
|
Cf. A053582, A069605, A069606, A069607, A069608, A069609, A069610, A069611, A069613, A069614, A069615, A069616, A069617, A069618, A069619, A069620.
Adjacent sequences: A069618 A069619 A069620 this_sequence A069622 A069623 A069624
Sequence in context: A070896 A081131 A069636 this_sequence A083077 A123821 A098782
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 27 2002
|
|
EXTENSIONS
|
More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 30 2003
|
|
|
Search completed in 0.002 seconds
|
