A209663 Numbers n with property that n is prime, n+18 is prime and both have equal sum of digits.

5, 13, 19, 23, 29, 43, 53, 79, 109, 113, 139, 149, 163, 173, 179, 223, 233, 239, 263, 313, 349, 379, 439, 443, 449, 491, 503, 523, 569, 613, 643, 659, 673, 691, 709, 733, 739, 743, 769, 809, 839, 859, 863, 919, 929, 953, 1013, 1033, 1069, 1091, 1153, 1163

Offset

1,1

Comments

Supersequence of A066540.

Links

Table of n, a(n) for n=1..52.

Example

613 is in the sequence because 613 is prime, 613+18 = 631 is also prime. Sum_of_digits(613) = 10 and Sum_of_digits(631) = 10.

Prog

(Magma) [p: p in PrimesUpTo(1200) | IsPrime(p+18) and  &+Intseq(p) eq &+Intseq(p+18)]; // Bruno Berselli, Mar 13 2012

Crossrefs

Cf. A066540.

Sequence in context: A272723 A245177 A067463 * A156111 A162174 A171603

Adjacent sequences: A209660 A209661 A209662 * A209664 A209665 A209666

Keyword

nonn,base

Author

Antonio Roldán, Mar 13 2012

Status

approved