A048526 Primes for which only four iterations of 'Prime plus its digit sum equals a prime' are possible.

37783, 85601, 259631, 268721, 350941, 371939, 378901, 516521, 665111, 733331, 883331, 967781, 1047929, 1056521, 1081721, 1258811, 1427411, 1480573, 1515929, 1584901, 1614929, 1842131, 1875311, 1885981, 2027801, 2044873, 2450531

Offset

1,1

Links

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

Example

prime 37783 -> 37783 + (3+7+7+8+3) = prime 37811 -> 37811 + (3+7+8+1+1) = prime 37831 -> 37831 + (3+7+8+3+1) = prime 37853 -> 37853 + (3+7+8+5+3) = prime 37879 -> next iteration yields composite 37913.

Crossrefs

Cf. A047791, A048519.

Sequence in context: A320208 A320217 A236883 * A190320 A250150 A345818

Adjacent sequences: A048523 A048524 A048525 * A048527 A048528 A048529

Keyword

nonn,base

Author

Patrick De Geest, May 15 1999

Extensions

Changed offset by Lars Blomberg, Dec 05 2013

Status

approved