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A095179
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Numbers whose reversed digit representation is prime, when leading zeros are omitted.
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4
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2, 3, 5, 7, 11, 13, 14, 16, 17, 20, 30, 31, 32, 34, 35, 37, 38, 50, 70, 71, 73, 74, 76, 79, 91, 92, 95, 97, 98, 101, 104, 106, 107, 110, 112, 113, 118, 119, 124, 125, 128, 130, 131, 133, 134, 136, 140, 142, 145, 146, 149, 151, 152, 157, 160, 164, 166, 167, 170, 172
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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EXAMPLE
| The number 70 in reverse is 07 which is prime.
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PROG
| (PARI) r(n) = for(x=1, n, y=eval(rev(x)); if(isprime(y), print1(x", "))) \ Get the reverse of the input string rev(str) = { local(tmp, j, s); tmp = Vec(Str(str)); s=""; forstep(j=length(tmp), 1, -1, s=concat(s, tmp[j])); return(s) }
(PARI) is_A095179(n)=isprime(eval(Strchr(vecextract(Vec(Vecsmall(Str(n))), "-1..1")))) \\ M. F. Hasler, Jan 13 2012
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CROSSREFS
| Cf. A007500 (primes in this sequence), A204232 (base 2 analog).
Sequence in context: A007933 A032524 A097312 * A074895 A072697 A090421
Adjacent sequences: A095176 A095177 A095178 * A095180 A095181 A095182
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KEYWORD
| base,easy,nonn
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AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Jun 21 2004
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