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Search: id:A024785
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| A024785 |
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Left-truncatable primes: every suffix is prime and no digits are zero. |
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+0
23
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| 2, 3, 5, 7, 13, 17, 23, 37, 43, 47, 53, 67, 73, 83, 97, 113, 137, 167, 173, 197, 223, 283, 313, 317, 337, 347, 353, 367, 373, 383, 397, 443, 467, 523, 547, 613, 617, 643, 647, 653, 673, 683, 743, 773, 797, 823, 853, 883, 937, 947, 953, 967, 983, 997, 1223, 1283, 1367
(list; graph; listen)
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OFFSET
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1,1
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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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N. J. A. Sloane, Table of n, a(n) for n = 1..4260 (The full list, based on the De Geest web site)
Index entries for sequences related to truncatable primes
P. De Geest, The list of 4260 left-truncatable primes
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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PROGRAM
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(PARI) {v=vector(4260); v[1]=2; v[2]=3; v[3]=5; v[4]=7; i=0; j=4; 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; ))); s=vector(4260); s=vecsort(v); for(i=1, j, write("b024785.txt", i, " ", s[i]); ); } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 19 2008]
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CROSSREFS
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Cf. A033664, A032437, A020994, A024770 (right-trucatable primes), A052023, A052024, A052025, A050986, A050987.
Sequence in context: A067905 A042993 A033664 this_sequence A069866 A125772 A001000
Adjacent sequences: A024782 A024783 A024784 this_sequence A024786 A024787 A024788
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KEYWORD
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nonn,base,fini
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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EXTENSIONS
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Comment from Eric Weisstein (eric(AT)weisstein.com): last term is a(4260)=357686312646216567629137 (Baillie, 1995).
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