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A107312
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Primes p such that p + 2 and p^2 + 2^2 are primes.
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0
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3, 5, 17, 137, 347, 827, 2087, 2687, 3557, 3917, 4517, 4967, 5477, 5657, 5867, 6827, 7457, 7547, 7877, 8087, 8537, 8597, 10037, 10427, 10937, 12107, 12377, 13397, 13877, 16067, 17837, 17987, 19427, 19697, 20507, 20717, 20807, 22367, 22637
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Primes are lesser twins. Except a(1) and a(2), all a(n) == 7(mod 10).
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MATHEMATICA
| Select[Prime[Range[3000]], PrimeQ[ #+2]&&PrimeQ[ #^2+4]&]
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PROG
| (MAGMA) [p: p in PrimesUpTo(25000)| IsPrime(p+2) and IsPrime(p^2+4)] [From Vincenzo Librandi, Jan 29 2011]
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CROSSREFS
| Cf. A045637.
Sequence in context: A087858 A191222 A084723 * A083213 A171271 A056826
Adjacent sequences: A107309 A107310 A107311 * A107313 A107314 A107315
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KEYWORD
| nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), May 21 2005
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