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 A108249 Consider primes p and q such that p = 3^k + 20 and q = 3^(k+1) + 20 for some k; sequence gives values of p. 1
 23, 29, 47, 101, 2207, 59069 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE 3^1 + 20 = 23, 3^2 + 20 = 29. PROG (PARI) g(m, n, b) = { for(x=0, n, y=m+b^x+b%2; z=m+b^(x+1)+b%2; if(isprime(y)&isprime(z), print1(y", ") ) ) } CROSSREFS Cf. A108258. Sequence in context: A108111 A085713 A102904 * A338324 A232725 A045120 Adjacent sequences: A108246 A108247 A108248 * A108250 A108251 A108252 KEYWORD nonn AUTHOR Cino Hilliard, Jun 29 2005 STATUS approved

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Last modified February 2 19:34 EST 2023. Contains 360024 sequences. (Running on oeis4.)