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 A176914 List of pairs of primes p_i < p_j such that p_i*p_j = p_i + p_{i+1} + p_{i+2} + ... + p_j. 0
 2, 5, 3, 13, 5, 31, 7, 53, 3536123, 128541727 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS First four pairs were found by F. Russo and the fifth by Philip Gibbs. It is not known whether other pairs exist. REFERENCES A. Murphy, "Smarandache friendly numbers and a few more sequences", Smarandache Notions Journal, Vol. 12, 1-2-3, Spring 2001. LINKS Table of n, a(n) for n=1..10. Philip Gibbs, A Fifth Smarandache Friendly Prime Pair Felice Russo, On a problem concerning the Smarandache friendly prime pairs Digital Library of Sciences EXAMPLE (2, 5) is a pair because 2 and 5 are primes and 2*5 = 2 + 3 + 5. Similarly (3, 13) is a pair because 3 and 13 are primes and 3*13 = 3 + 5 + 7 + 11 + 13. CROSSREFS Sequence in context: A279342 A169852 A318189 * A194010 A229609 A242171 Adjacent sequences: A176911 A176912 A176913 * A176915 A176916 A176917 KEYWORD nonn,more AUTHOR G. Ornea (gornea2005(AT)gmail.com), Apr 28 2010 EXTENSIONS Edited by N. J. A. Sloane, Jul 02 2017 STATUS approved

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Last modified September 7 17:00 EDT 2024. Contains 375749 sequences. (Running on oeis4.)