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 A227957 Number of primes that are of the form n - 2^k - k^2. 0
 0, 0, 1, 1, 1, 2, 0, 2, 0, 2, 1, 1, 1, 2, 1, 1, 0, 1, 2, 3, 1, 2, 0, 2, 1, 1, 1, 1, 0, 2, 1, 2, 0, 3, 1, 1, 2, 1, 2, 2, 0, 1, 1, 2, 2, 2, 0, 2, 2, 1, 2, 0, 0, 2, 2, 1, 0, 1, 1, 3, 2, 3, 1, 3, 0, 0, 1, 2, 2, 3, 0, 1, 1, 3, 2, 3, 0, 1, 2, 2, 1, 1, 0, 2, 1, 2, 1, 2, 0, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 COMMENTS Indices of zeros in the sequence are 1, 2, 7, 9, 17, 23, 29, 33, 41, 47, 52, ... LINKS PROG (PARI) a(n)=sum(k=0, log(n)\log(2), isprime(n-2^k-k^2)) \\ Charles R Greathouse IV, Mar 18 2014 CROSSREFS Sequence in context: A230632 A052511 A054533 * A247977 A143232 A096030 Adjacent sequences:  A227954 A227955 A227956 * A227958 A227959 A227960 KEYWORD nonn,less AUTHOR Irina Gerasimova, Oct 26 2013 EXTENSIONS Terms corrected by R. J. Mathar, Oct 26 2013 STATUS approved

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Last modified September 26 15:27 EDT 2017. Contains 292531 sequences.