A242386 Lesser of consecutive primes whose sum is a palindromic number.

2, 3, 109, 211, 347, 409, 1051, 1493, 2111, 2273, 3167, 4219, 4441, 10099, 10853, 10903, 11353, 11909, 12823, 12973, 13421, 13831, 14543, 14639, 20551, 21011, 21347, 21661, 21863, 22271, 23581, 23981, 30047, 30557, 31259, 31307, 31963, 32069, 32213, 32467, 32869, 33029

Offset

1,1

Links

Chai Wah Wu, Table of n, a(n) for n = 1..10000

Example

2111 is in the sequence because 2111 is prime, nextprime(2111) = 2113 and 2111 + 2113 = 4224, palindromic number.

Prog

(PARI)
palind(n)=Str(n)==concat(Vecrev(Str(n)))
{k=2; while(k<10^5, m=nextprime(k+1); if(palind(k+m), print1(k, ", ")); k=m)}

Crossrefs

Cf. A162571 (resulting palindromes), A242387.

Sequence in context: A109349 A330842 A235619 * A114373 A117700 A356789

Adjacent sequences: A242383 A242384 A242385 * A242387 A242388 A242389

Keyword

nonn,base

Author

Antonio Roldán, May 12 2014

Status

approved