A132394 Left-truncatable primes in the order generated (with no zero digits).

2, 3, 5, 7, 13, 23, 43, 53, 73, 83, 17, 37, 47, 67, 97, 113, 313, 613, 223, 523, 823, 443, 643, 743, 353, 653, 853, 953, 173, 373, 673, 773, 283, 383, 683, 883, 983, 317, 617, 137, 337, 937, 347, 547, 647, 947, 167, 367, 467, 967, 197, 397, 797, 997, 2113

Offset: 1

Author

Harry J. Smith, Nov 11 2007

Keywords

• base
• fini
• full
• nonn

Comments

The most logical way of generating the Left-truncatable primes generates them in this order. Last term is a(4260)=357686312646216567629137.

Links

• H. J. Smith, Table of n, a(n) for n = 1..4260 (full sequence)
• I. O. Angell and H. J. Godwin, On Truncatable Primes, Math. Comput. 31, 265-267, 1977.
• H. J. Smith, Link to program to generate this sequence and its output file.
• Index entries for sequences related to truncatable primes

Crossrefs

Cf. A024785.

Programs

PARI

{fileO="b132394.txt";v=vector(4260);v[1]=2;v[2]=3;v[3]=5;v[4]=7;i=0;j=4; write(fileO,"1 2");write(fileO,"2 3");write(fileO,"3 5");write(fileO,"4 7"); until(i>=j,i++;p=v[i];P10=10^(1+log(p)\log(10)); for(k=1,9,z=k*P10+p;if(isprime(z),j++;v[j]=z;write(fileO,j," ",z);)));} \\ Harry J. Smith, Sep 18 2008

Extensions

Edited by Jason G. Wurtzel, Oct 06 2010