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A230047 Palindromic primes with nondecreasing product of digits. 1
2, 3, 5, 7, 181, 191, 313, 353, 373, 383, 727, 757, 787, 797, 17971, 19891, 19991, 34843, 35753, 36563, 37573, 38783, 74747, 75557, 76667, 77977, 78787, 78887, 79997, 1987891, 1988891, 1998991, 3479743, 3487843, 3569653, 3586853, 3589853, 3689863, 3698963 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(1) = 2; a(n+1) is the smallest palindromic prime with product of digits >= product of digits of a(n).

LINKS

Shyam Sunder Gupta, Table of n, a(n) for n = 1..149

MATHEMATICA

a = {}; t = 0; Do[z = n*10^(IntegerLength[n] - 1) + FromDigits@Rest@Reverse@IntegerDigits[n]; If[PrimeQ[z], s = Apply[Times, IntegerDigits[z]]; If[s >= t, t = s; AppendTo[a, z]]], {n, 10^4}]; a

CROSSREFS

Cf. A002385, A069802.

Sequence in context: A230046 A098463 A064155 * A230042 A230045 A069803

Adjacent sequences:  A230044 A230045 A230046 * A230048 A230049 A230050

KEYWORD

nonn,base

AUTHOR

Shyam Sunder Gupta, Oct 06 2013

STATUS

approved

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Last modified January 20 10:18 EST 2022. Contains 350471 sequences. (Running on oeis4.)