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 A192896 Prime factor addition sequence: For the term n, add all the prime factors of n to n. If n is a prime then add n to it. Start with n = 3 2
 3, 6, 11, 22, 35, 47, 94, 143, 167, 334, 503, 1006, 1511, 3022, 4535, 5447, 5879, 11758, 17639, 18239, 18336, 18540, 18658, 19170, 19257, 19405, 23291, 46582, 69875, 69946, 70842, 82654, 82714, 124073, 126467, 137975 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS If n has repeated prime factors, then these are added as indicated by the exponents. For example, 18336 = 2^5 * 3 * 191, therefore we add 2 five times in our sum to obtain the next term of the sequence. - Alonso del Arte, Jul 12 2011 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 EXAMPLE For n = 3, n is a prime number so the next term is 6. For n = 6, n is not a prime factor, as n = 2*3, so the next term = 6+2+3 = 11. MATHEMATICA a := 3; a[n_] := a[n] = a[n - 1] + Plus@@Times@@@FactorInteger@a[n - 1]; Table[a[n], {n, 40}] (* Alonso del Arte, Jul 12 2011 *) PROG (PARI) A192896(n, m=3) = { for(i=1, n, m+=A001414(m)); m } \\ M. F. Hasler, Jul 18 2011 CROSSREFS Cf. A096461, similar but starting with 2 rather than 3. See also A001414. Sequence in context: A104253 A283668 A191581 * A115030 A228206 A195734 Adjacent sequences:  A192893 A192894 A192895 * A192897 A192898 A192899 KEYWORD nonn AUTHOR Lawrence Hollom, Jul 12 2011 EXTENSIONS More terms from Vincenzo Librandi and Alonso del Arte, Jul 12 2011 Offset corrected to 0 (so as to have a(n) = n times iterated A001414 acting on the initial value) by M. F. Hasler, Jul 18 2011 STATUS approved

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Last modified September 21 04:59 EDT 2019. Contains 327253 sequences. (Running on oeis4.)