|
Search: id:A069090
|
|
|
| A069090 |
|
Primes none of whose proper initial segments are primes. |
|
+0
2
|
|
| 2, 3, 5, 7, 11, 13, 17, 19, 41, 43, 47, 61, 67, 83, 89, 97, 101, 103, 107, 109, 127, 149, 151, 157, 163, 167, 181, 401, 409, 421, 443, 449, 457, 461, 463, 467, 487, 491, 499, 601, 607, 631, 641, 643, 647, 653, 659, 661, 683, 691, 809, 811, 821, 823, 827, 829
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Franklin T. Adams-Watters, Table of n, a(n) for n=0..1000
|
|
EXAMPLE
|
The proper initial segments of 499 are 4 and 49, none of which are primes. So 499 is a term of the sequence.
|
|
PROGRAM
|
(PARI) ina(n)=if(!isprime(n), return(0)); while(n>9, n\=10; if(isprime(n), return(0))); 1 [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 26 2009]
|
|
CROSSREFS
|
Cf. A074721. [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 26 2009]
Sequence in context: A002200 A069709 A144755 this_sequence A088415 A139054 A003309
Adjacent sequences: A069087 A069088 A069089 this_sequence A069091 A069092 A069093
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Apr 05 2002
|
|
EXTENSIONS
|
More terms from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 26 2009
|
|
|
Search completed in 0.002 seconds
|
