A157138 - OEIS

A157138

Even numbers k such that k and prime(k) have the same number of even digits.

10, 14, 18, 38, 48, 52, 54, 58, 60, 70, 76, 80, 82, 86, 92, 94, 96, 98, 112, 114, 124, 132, 136, 138, 140, 142, 144, 158, 170, 174, 180, 192, 194, 198, 234, 236, 252, 254, 258, 290, 306, 318, 320, 324, 326, 342, 348, 350, 352, 356, 364, 366, 368, 370, 374, 376

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OFFSET

1,1

COMMENTS

Can this sequence be proved to be infinite?

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

10 is a term: prime(10)=29, and 10 and 29 each have 1 even digit.

14 is a term: prime(14)=43, and 14 and 43 each have 1 even digit.

18 is a term: prime(18)=61, and 18 and 61 each have 1 even digit.

124 is a term: prime(124)=683, and 124 and 683 each have 2 even digits.