A227892 Smaller of two consecutive palindromic primes whose product of digits is equal and nonzero.

191, 1129211, 3218123, 7129217, 7718177, 125292521, 146181641, 171292171, 197292791, 198292891, 316141613, 325383523, 359292953, 767292767, 773181377, 777494777, 929292929, 946141649, 983181389, 992181299, 11222922211, 11584948511, 11942924911, 11991819911

Offset

1,1

Links

Shyam Sunder Gupta, Table of n, a(n) for n = 1..5000

Example

191 is in the sequence because 191 and 313 are consecutive palindromic primes and the product of the digits of each = 9.

Mathematica

Select[Partition[Select[Prime[Range[542*10^6]], PalindromeQ], 2, 1], Times @@ IntegerDigits[ #[[1]]] ==Times@@IntegerDigits[#[[2]]]>0&][[All, 1]] (* Harvey P. Dale, Dec 23 2022 *)

Crossrefs

Cf. A230083, A007954, A053666, A230228, A230200.

Sequence in context: A207218 A185716 A084003 * A118095 A155843 A187527

Adjacent sequences: A227889 A227890 A227891 * A227893 A227894 A227895

Keyword

nonn,base

Author

Shyam Sunder Gupta, Oct 14 2013

Status

approved