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

Author

Patrick De Geest, May 15 1999

Keywords

• nonn
• base

Examples

			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.
		

Links

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

Crossrefs

Cf. A047791, A048519.

Extensions

Changed offset by Lars Blomberg, Dec 05 2013