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 A292283 Numbers n such that f(g(n)) - g(f(n)) = n where f = A001065 and g = A051953. 0
 9358, 209662, 2900878, 199550158 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS If 2*p is in this sequence for a prime p, then p + 2 is the arithmetic mean of sigma(p + 1) and phi(p + 3). For the first four terms, primes p such that 2*p is in this sequence are 4679, 104831, 1450439, 99775079. a(5) > 3*10^10. - Giovanni Resta, Sep 15 2017 LINKS EXAMPLE 9358 is a term because A001065(A051953(9358)) - A051953(A001065(9358)) = 11700 - 2342 = 9358. PROG (PARI) a001065(n) = sigma(n)-n; a051953(n) = n-eulerphi(n); isok(n) = a001065(a051953(n))-a051953(a001065(n))==n; CROSSREFS Cf. A001065, A051953, A291869, A292208. Sequence in context: A004974 A251824 A228519 * A265457 A330902 A323803 Adjacent sequences:  A292280 A292281 A292282 * A292284 A292285 A292286 KEYWORD nonn,more AUTHOR Altug Alkan, Sep 13 2017 STATUS approved

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Last modified January 19 11:42 EST 2022. Contains 350465 sequences. (Running on oeis4.)