A050774 Iterated procedure 'composite k added to sum of its prime factors reaches a prime' yields 7 skipped primes.

39, 40, 58, 78, 205, 272, 330, 341, 357, 437, 475, 476, 520, 533, 551, 616, 738, 833, 1105, 1184, 1274, 1984, 2262, 2312, 2652, 2964, 3008, 3010, 3198, 3444, 3776, 4386, 5530, 5831, 6020, 6204, 6360, 6768, 7056, 7380, 7420, 7930, 8322, 8835, 8844, 8991

Offset

1,1

Links

Table of n, a(n) for n=1..46.

Example

a(1)=39 + (3+13) = 55 + (5+11) = ending prime 71. Between 39 and 71 one finds 7 primes 41, 43, 47, 53, 59, 61 and 67.

Crossrefs

Cf. A050703, A050710.

Sequence in context: A291517 A165860 A223745 * A041759 A257442 A261374

Adjacent sequences: A050771 A050772 A050773 * A050775 A050776 A050777

Keyword

nonn

Author

Patrick De Geest, Sep 15 1999

Extensions

Offset corrected by Sean A. Irvine, Aug 18 2021

Status

approved