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A072746
Number of pairs of primes (p, q) such that, for some integer k, (p+q)/2 = 2^k, 2^(k-1) < p < q, and p <= n.
2
0, 0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8
OFFSET
1,5
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jul 08 2002
EXTENSIONS
Name corrected by Jon E. Schoenfield, Jun 30 2021
STATUS
approved