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Search: id:A132394
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| A132394 |
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Left-truncatable primes in the order generated (with no zero digits). |
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+0
2
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| 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
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The most logical way of generating the Left-truncatable primes genetates them in this order. Last term is a(4260)=357686312646216567629137.
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REFERENCES
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Angell, I. O. and Godwin, H. J. "On Truncatable Primes." Math. Comput. 31, 265-267, 1977.
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LINKS
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H. J. Smith, Table of n, a(n) for n = 1..4260
Index entries for sequences related to truncatable primes
H. J. Smith, Link to program to generate this sequense and its output file.
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PROGRAM
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(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); ))); } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 18 2008]
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CROSSREFS
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Cf. A024785.
Sequence in context: A048413 A064336 A126092 this_sequence A006992 A080190 A076994
Adjacent sequences: A132391 A132392 A132393 this_sequence A132395 A132396 A132397
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KEYWORD
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base,fini,nonn
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AUTHOR
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Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 11 2007
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