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 A084440 Number of ways to write the n-th prime as 1+p+p^k, p prime and k>0. 5
 0, 0, 1, 2, 2, 1, 0, 1, 1, 0, 2, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS a(A084441(n))>0, a(A084442(n))=1, a(A084443(n))=0. LINKS EXAMPLE a(11)=2: prime(11) = 31 = 1+5+5^2 = 1+3+3^3. CROSSREFS Sequence in context: A227193 A287397 A111407 * A179287 A016372 A016342 Adjacent sequences:  A084437 A084438 A084439 * A084441 A084442 A084443 KEYWORD nonn AUTHOR Reinhard Zumkeller, May 26 2003 STATUS approved

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Last modified July 25 13:59 EDT 2021. Contains 346290 sequences. (Running on oeis4.)