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A090259 Least even a(n) not representable as a sum of two of the first n primes. From Goldbach conjecture. +0
1
6, 8, 12, 16, 20, 28, 32, 40, 44, 44, 56, 64, 76, 76, 92, 92, 92, 110, 116, 116, 136, 136, 148, 164, 174, 182, 188, 188, 220, 224, 232, 242, 242, 256, 260, 272, 272, 292, 292, 292, 332, 350, 350, 368, 368, 368, 400, 400, 412, 412, 436, 442, 442, 476, 476, 476 (list; graph; listen)
OFFSET

1,1

COMMENT

a(n)<=2p(n)+2, where p(n) is the n-th prime.

EXAMPLE

a(5)=20 since {2,3,5,7,11} can't represent 20 as a sum of two primes

CROSSREFS

Cf. A002372.

Sequence in context: A059611 A115166 A050992 this_sequence A089241 A027691 A146529

Adjacent sequences: A090256 A090257 A090258 this_sequence A090260 A090261 A090262

KEYWORD

nonn

AUTHOR

Ed T. Prothro (prothro(AT)compuserve.com), Jan 24 2004

page 1

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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