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A050771
Iterated procedure 'composite k added to sum of its prime factors reaches a prime' yields 4 skipped primes.
0
8, 9, 34, 38, 51, 65, 68, 85, 96, 116, 143, 224, 225, 304, 306, 416, 448, 544, 546, 570, 600, 621, 640, 714, 783, 810, 1020, 1134, 1197, 1254, 1280, 1408, 1521, 1540, 1666, 1716, 1806, 1900, 1953, 2088, 2646, 2760, 3159, 3185, 3255, 3392, 3920, 3968, 4176
OFFSET
0,1
EXAMPLE
a(2)=9 + (3+3) = 15 + (3+5) = ending prime 23. Between 9 and 23 one finds 4 primes 11, 13, 17 and 19.
CROSSREFS
Sequence in context: A371443 A038344 A306162 * A120776 A041136 A041915
KEYWORD
nonn
AUTHOR
Patrick De Geest, Sep 15 1999
STATUS
approved