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 A118958 Primes that cannot be written as 2^k + p with p prime < 2^k. 5
 2, 3, 5, 17, 31, 41, 47, 53, 59, 73, 79, 89, 97, 103, 109, 113, 127, 137, 149, 163, 167, 173, 179, 191, 193, 197, 223, 227, 233, 239, 251, 257, 271, 277, 281, 283, 307, 311, 313, 331, 337, 347, 349, 367, 373, 379, 389, 397, 401, 409, 421, 431, 433, 439, 443 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A118953(A049084(a(n))) = 0; A065381 is a subsequence. LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE filter:= proc(n) not isprime(n-2^ilog2(n)) end proc: select(filter, [seq(ithprime(i), i=1..100)]); # Robert Israel, Jan 27 2021 MATHEMATICA okQ[n_] := !PrimeQ[n-2^(Length[IntegerDigits[n, 2]]-1)]; Select[Prime[Range[100]], okQ] (* Jean-François Alcover, Feb 04 2023 *) CROSSREFS Cf. A118957, A091932, A156695. Cf. A049084, A065381, A118953. Sequence in context: A349678 A029972 A077498 * A259596 A189536 A163588 Adjacent sequences: A118955 A118956 A118957 * A118959 A118960 A118961 KEYWORD nonn AUTHOR Reinhard Zumkeller, May 07 2006 STATUS approved

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Last modified April 17 08:05 EDT 2024. Contains 371756 sequences. (Running on oeis4.)