A228200 Smallest of 9 consecutive primes whose sum is not a prime.

2, 5, 7, 11, 13, 17, 19, 23, 41, 43, 53, 59, 61, 67, 71, 73, 97, 101, 103, 113, 137, 151, 163, 167, 181, 191, 223, 227, 229, 233, 239, 251, 257, 263, 269, 271, 281, 283, 293, 307, 311, 313, 317, 331, 337, 349, 353, 379, 383, 401, 409, 419, 421, 431, 439, 443, 457, 461

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Example

59 is in the sequence because 59 + 61 + 67 + 71 + 73 + 79 + 83 + 89 + 97 = 679 and 679 is not a prime.

Mathematica

Transpose[Select[Partition[Prime[Range[150]], 9, 1], !PrimeQ[Total[#]]&]][[1]]

Prog

(Magma) [NthPrime(n): n in [1..120] |not IsPrime(&+[NthPrime(n+s): s in [0..8]])];

Crossrefs

Cf. A189571, A127336.

Sequence in context: A087685 A020619 A165439 * A245063 A168033 A331486

Adjacent sequences: A228197 A228198 A228199 * A228201 A228202 A228203

Keyword

nonn,easy

Author

Vincenzo Librandi, Aug 20 2013

Status

approved