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 A139803 A033875(n) + 2^a(n) = A033875(n+1). 2
 0, 1, 1, 2, 1, 2, 1, 2, 3, 4, 5, 2, 7, 4, 1, 2, 3, 4, 9, 2, 955, 468 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS a(23) > 10^4. - Zak Seidov, Jan 24 2017 a(23) > 30000 (if it exists). - Pontus von Brömssen, Jan 08 2023 LINKS Table of n, a(n) for n=1..22. FORMULA a(n) = A067760((A033875(n)-1)/2) for n >= 2. - Pontus von Brömssen, Jan 08 2023 EXAMPLE a(10) = 4 because A033875(10) = 31, 31 + 2^4 = 47, which is prime. MATHEMATICA p = 2; n = 0; While[true, x = 0; While[ ! PrimeQ[p + 2^x], x++ ]; p = p + 2^x; Print[x]; n++ ] CROSSREFS Skipping from prime to prime by least powers of 2: A033875. Cf. A059662, A067760. Sequence in context: A234022 A261273 A097454 * A058746 A080916 A071622 Adjacent sequences: A139800 A139801 A139802 * A139804 A139805 A139806 KEYWORD nonn,more AUTHOR Johan Särnbratt, May 22 2008 STATUS approved

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Last modified October 3 10:22 EDT 2023. Contains 365859 sequences. (Running on oeis4.)