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A282565
a(n) is the largest prime p < 2^n such that p + 2^n is also prime.
0
3, 5, 13, 29, 43, 113, 223, 509, 907, 2003, 4051, 8171, 16333, 32603, 65437, 130649, 262027, 524261, 1048507, 2097047, 4194277, 8388209, 16776481, 33554201, 67108753, 134217401, 268435273, 536869631, 1073741719, 2147483549, 4294966477, 8589934307, 17179868383
OFFSET
2,1
EXAMPLE
13 + 16 (2^4) = 29 (prime).
29 + 32 (2^5) = 61 (prime).
43 + 64 (2^6) = 107 (prime).
CROSSREFS
Sequence in context: A147196 A110225 A065047 * A295617 A290113 A238216
KEYWORD
nonn
AUTHOR
Emre APARI, Feb 18 2017
STATUS
approved