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 A209915 Number of ways the n-th prime p(n) can be written as a multiple of its reversal A004086(p) +/- a prime q < p(n). 1
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 2, 0, 0, 1, 0, 4, 0, 3, 0, 0, 2, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 2, 4, 0, 0, 0, 0, 0, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,13 COMMENTS Sequence A209063 is a subsequence which contains all (but not only) nonzero terms. LINKS FORMULA A209915 = A209914 o A000040. PROG (PARI) a(n)={my(r=A004086(n=prime(n))); sum(k=1, (2*n-1)\r, isprime(abs(n-k*r)))} CROSSREFS Cf. A209063. Sequence in context: A323911 A322581 A347083 * A349386 A349349 A349443 Adjacent sequences:  A209912 A209913 A209914 * A209916 A209917 A209918 KEYWORD nonn,base AUTHOR M. F. Hasler, Mar 15 2012 STATUS approved

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Last modified May 23 23:07 EDT 2022. Contains 353993 sequences. (Running on oeis4.)