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A048527 Primes for which only five iterations of 'Prime plus its digit sum equals a prime' are possible. 8
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 25 12:01 EST 2020. Contains 332233 sequences. (Running on oeis4.)