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Search: id:A077359
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| A077359 |
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Primes whose external digits form a prime. Or primes from which deleting the internal digits leaves a prime. |
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+0
5
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| 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 223, 229, 233, 239, 263, 269, 283, 293, 307, 311, 317, 331
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI) {exdigs(n)=local(a, j, d); d=divrem(n, 10); a=d[2]; n=d[1]; j=1; while(n>10, d=divrem(n, 10); n=d[1]; j=10*j); 10*n+a} forprime(p=1, 335, if(isprime(exdigs(p)), print1(p, ", ")))
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CROSSREFS
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Cf. A069686, A077360.
Sequence in context: A015919 A064555 A095320 this_sequence A057448 A049551 A058853
Adjacent sequences: A077356 A077357 A077358 this_sequence A077360 A077361 A077362
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 05 2002
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EXTENSIONS
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Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 06 2002
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