A261142 Numbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits.

88, 248, 826, 1417, 1571, 1595, 3682, 3928, 4448, 5089, 5137, 6479, 7754, 8038, 8384, 8461, 9257, 9640, 10393, 10825, 10922, 11878, 13294, 14290, 14767, 14941, 15977, 16786, 17684, 17777, 17935, 18437, 18677, 19495, 20497, 20555, 21649, 22487, 23239, 23396

Offset: 1

Author

Zak Seidov, Oct 22 2015

Keywords

• nonn
• base

Comments

Hence both p and q are Honaker primes (A033548) and both n and p are terms in A033549.

Examples

			n=88, p=prime(n)=457 and q=prime(p)=3229 have the same sum of digits=16;
n=248, p=prime(n)=1571 and q=prime(p)=13217 have the same sum of digits=14;
n=660349, p=178115131 and q=178115131 have the same sum of digits=28.
		

Crossrefs

Cf. A000040, A000720, A007953, A033548, A033549.