A048527 Primes for which only five iterations of 'Prime plus its digit sum equals a prime' are possible.

516493, 1056493, 1427383, 1885943, 3166183, 3805183, 4241593, 6621283, 7646953, 12912283, 17987839, 32106493, 107152093, 120224773, 131144473, 133210873, 139388891, 142782877, 150326173, 155382923, 177865819, 184081943, 227795839, 242376877, 264174877

Offset

1,1

Links

Lars Blomberg, Table of n, a(n) for n = 1..3000

Example

516493 -> 516521 -> 516541 -> 516563 -> 516589 -> 516623 -> next iteration yields a composite.

Prog

(PARI) forprime(p=2, , isprime(pp=A062028(p))&& !for(i=2, 5, isprime(pp=A062028(pp))||next(2))&& !isprime(A062028(pp))&& print1(p", ")) \\ M. F. Hasler, Nov 08 2018

Crossrefs

Cf. A047791, A048519, A062028 (n + digit sum of n).

Cf. A048523, A048524, A048525, A048526.

Sequence in context: A254240 A087096 A072959 * A255041 A255034 A256952

Adjacent sequences: A048524 A048525 A048526 * A048528 A048529 A048530

Keyword

nonn,base

Author

Patrick De Geest, May 15 1999

Extensions

Offset changed to 1 and a(15)-a(24) from Lars Blomberg, Dec 04 2013

Status

approved