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

1,1

Comments

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

Links

Table of n, a(n) for n=1..40.

Example

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.

Sequence in context: A116448 A046330 A304519 * A328872 A001347 A003782

Adjacent sequences: A261139 A261140 A261141 * A261143 A261144 A261145

Keyword

nonn,base

Author

Zak Seidov, Oct 22 2015

Status

approved