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A048525 Primes for which only three iterations of 'Prime plus its digit sum equals a prime' are possible. 3
277, 1559, 5779, 7489, 11279, 15091, 22093, 37811, 43579, 46279, 48541, 49957, 53479, 54751, 60589, 68473, 72883, 74821, 83621, 85621, 90793, 91921, 93901, 97501, 107981, 110899, 111799, 120193, 153379, 157739, 170299, 180731, 184441 (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 7489 -> 7489 + (7+4+8+9) = prime 7517 -> 7517 + (7+5+1+7) = prime 7537 -> 7537 + (7+5+3+7) = prime 7559 -> next iteration yields composite 7585.

CROSSREFS

Cf. A047791, A048519.

Sequence in context: A105977 A297891 A236803 * A189609 A264371 A154231

Adjacent sequences:  A048522 A048523 A048524 * A048526 A048527 A048528

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1999

STATUS

approved

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Last modified May 22 09:50 EDT 2022. Contains 353949 sequences. (Running on oeis4.)