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A054997
Integers that can be expressed as the sum of consecutive primes in exactly 2 ways.
7
5, 17, 23, 31, 36, 53, 59, 60, 67, 71, 72, 90, 97, 100, 101, 109, 112, 119, 120, 127, 131, 138, 139, 143, 152, 173, 180, 181, 187, 204, 210, 211, 221, 228, 233, 258, 263, 269, 271, 276, 300, 304, 323, 330, 331, 349, 353, 372, 373, 379, 384, 390, 395, 408
OFFSET
1,1
REFERENCES
R. K. Guy, Unsolved Problems in Number Theory, section C2.
LINKS
Carlos Rivera, Puzzle 46. Primes expressible as sum of consecutive primes in K ways, The Prime Puzzles and Problems Connection.
FORMULA
A054845(a(n)) = 2. - Ray Chandler, Sep 20 2023
EXAMPLE
5 can be expressed as 5 or 2+3, so 5 is in the sequence.
KEYWORD
nonn
AUTHOR
Jud McCranie, May 30 2000
STATUS
approved