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A049493 Numbers n such that n and n+4^k are all primes for k=1,2,3. +0
3
3, 7, 37, 43, 67, 163, 757, 823, 967, 1087, 1213, 1303, 1423, 2293, 2377, 3187, 3343, 3847, 5653, 5923, 8677, 8803, 9157, 9277, 9787, 11257, 11617, 11923, 12097, 13693, 14653, 14767, 14827, 15667, 15733, 16417, 18127, 18397, 20113, 20743, 26293 (list; graph; listen)
OFFSET

1,1

EXAMPLE

3,3+4=7,3+16=19,3+64=67 are all primes

CROSSREFS

Cf. A023200.

Sequence in context: A081010 A100377 A167169 this_sequence A020463 A057625 A087208

Adjacent sequences: A049490 A049491 A049492 this_sequence A049494 A049495 A049496

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu)

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.


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