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A048524 Primes for which only two iterations of 'Prime plus its digit sum equals a prime' are possible. 6
11, 59, 101, 149, 167, 257, 293, 367, 419, 479, 547, 617, 727, 839, 1409, 1579, 1847, 2039, 2129, 2617, 2657, 2837, 3449, 3517, 3539, 3607, 3719, 4217, 4637, 4877, 5689, 5807, 5861, 6037, 6257, 6761, 7027, 7517, 8039, 8741, 8969, 9371, 9377, 10667 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Lars Blomberg, Table of n, a(n) for n = 1..10000

EXAMPLE

prime 727 -> 727 + (7+2+7) = prime 743 -> 743 + (7+4+3) = prime 757 -> next iteration yields composite 776.

MATHEMATICA

Select[Prime[Range[1400]], Boole[PrimeQ[Rest[NestList[ #+Total[ IntegerDigits[ #]]&, #, 3]]]] == {1, 1, 0}&] (* Harvey P. Dale, Oct 31 2018 *)

CROSSREFS

Cf. A047791, A048519.

Sequence in context: A273618 A168539 A320882 * A186312 A142401 A139859

Adjacent sequences:  A048521 A048522 A048523 * A048525 A048526 A048527

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1999

EXTENSIONS

Changed offset by Lars Blomberg, Dec 05 2013

STATUS

approved

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Last modified May 17 09:03 EDT 2021. Contains 343969 sequences. (Running on oeis4.)