A154561 - OEIS

A154561

Primes resulting from (sum of digits of k) + (sum of digits of prime(k)) as k runs through the positive integers.

3, 5, 11, 7, 13, 17, 23, 13, 23, 23, 13, 17, 23, 29, 19, 17, 29, 23, 17, 19, 23, 29, 23, 19, 31, 23, 17, 19, 29, 31, 31, 23, 11, 19, 19, 17, 19, 23, 17, 17, 17, 23, 29, 31, 23, 29, 23, 13, 19, 19, 31, 23, 23, 17, 11, 31, 23, 13, 23, 29, 23, 29, 29, 19, 23, 31, 37, 29, 37, 17

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..70.

EXAMPLE

k=1 yields a term: prime(1) = 2 and 1 + 2 = 3 is prime, so a(1)=3;

k=2 yields a term: prime(2) = 3 and 2 + 3 = 5 is prime, so a(2)=5;

k=3 does not yield a term: prime(3) = 5 and 3 + 5 = 8 is composite;

k=4 yields a term: prime(4) = 7 and 4 + 7 = 11 is prime, so a(3)=11;

k=5 yields a term: prime(5) = 11 and 5 + 1 + 1 = 7 is prime, so a(4)=7.

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