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 A318971 Primes that divide at least one term of A318970. 2
 3, 29, 31821709567, 28480625878963 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS No other terms below 10^14. If prime p does not divide any of the first A227944(p) <= log2(p) terms of A318970, then p does not divide any term of A318970, i.e., p does not belong to this sequence. (2^260+5)/261 is a term (76-digit prime). Hence, a(5) <= (2^260+5)/261. Any prime p with A318989(p)=0 belongs to this sequence. However, it is unknown if there is a term p with nonzero A318989(p). LINKS Max Alekseyev, Iterations of 2^(n-1)+5: the strong law of small numbers, or something bigger?, MathOverflow, 2016. EXAMPLE a(1)=3 divides A318970(k) for all k >= 1. a(2)=29 divides A318970(k) for all k >= 3. a(3)=31821709567 divides A318970(k) for all k >= 8. a(4)=28480625878963 divides A318970(k) for all k >= 11. CROSSREFS Cf. A227944, A245594, A318970, A318989. Sequence in context: A112981 A178336 A176495 * A082792 A078242 A108739 Adjacent sequences:  A318968 A318969 A318970 * A318972 A318973 A318974 KEYWORD nonn,more,hard AUTHOR Max Alekseyev, Sep 06 2018 STATUS approved

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Last modified April 15 07:59 EDT 2021. Contains 342975 sequences. (Running on oeis4.)