A070831 Palindromic primes with digit sum = 11.

191, 353, 13331, 1123211, 1221221, 1303031, 1311131, 3103013, 110232011, 111050111, 112030211, 112111211, 121111121, 130030031, 301111103, 10000900001, 10002520001, 10013131001, 10111311101, 10301110301

Offset

1,1

Comments

Conjecture: The sequence is unbounded.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..2388

Mathematica

Do[p = Join[ IntegerDigits[n], Reverse[ Drop[ IntegerDigits[n], -1]]]; q = Plus @@ p; If[ PrimeQ[ FromDigits[p]] && q == 11, Print[ FromDigits[p]]], {n, 1, 10^6}]

Crossrefs

Cf. A002385, A070247, A070248 and A070249.

Sequence in context: A367318 A142806 A142086 * A147108 A147116 A142677

Adjacent sequences: A070828 A070829 A070830 * A070832 A070833 A070834

Keyword

base,nonn

Author

Robert G. Wilson v, May 15 2002

Status

approved