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 A257929 Primes equal to the sum of the prime factors, with multiplicity, of the next k numbers, for some k. 3
 5, 19, 37, 139, 262880929, 1551042113, 64548518479, 1573353619909 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Values of k are 1, 2, 2, 3, 17, 10, 25, 51, ... a(9) > 3*10^12. - Giovanni Resta, May 16 2015 LINKS EXAMPLE For 5, consider the prime factors of the next number, 6: 2, 3. Their sum is 2 + 3 = 5. For 19, consider the prime factors of the next 2 numbers, 20, 21: 2, 2, 5; 3, 7. Their sum is 2 + 2 + 5 + 3 + 7 = 19. MAPLE with(numtheory): P:= proc(q) local a, d, j, k, n; for n from 2 to q do if isprime(n) then a:=0; k:=0; while a

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Last modified May 16 10:41 EDT 2021. Contains 343941 sequences. (Running on oeis4.)