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 A339134 Indices in A338884 where records occur. 0
 1, 4, 12, 66, 346, 5876, 95078, 9411222, 1894078221 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS It seems that A338884(a(n)) = n and 3*sqrt(log(a(n)))/n ~ O(1). LINKS Table of n, a(n) for n=1..9. PROG (Python) from sympy import isprime def search(n): k = 1 while 1: i = k*n + 1 while i < k*n + k: if isprime(i) == 1: return i i += 2 k = 2*k a_rec = 0 n = 1 while 1: m = search(n) a = m.bit_length() - n.bit_length() if a > a_rec: print(n) a_rec = a n += 1 CROSSREFS Cf. A000040, A070939, A208241, A338884. Sequence in context: A221667 A275527 A222612 * A000843 A369284 A358409 Adjacent sequences: A339131 A339132 A339133 * A339135 A339136 A339137 KEYWORD nonn,base,more AUTHOR Ya-Ping Lu, Nov 24 2020 STATUS approved

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Last modified July 13 11:56 EDT 2024. Contains 374282 sequences. (Running on oeis4.)