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A230046 Palindromic primes with nondecreasing sum of digits. 1
2, 3, 5, 7, 151, 181, 191, 353, 373, 383, 727, 757, 787, 797, 17971, 19891, 19991, 38783, 74747, 75557, 76367, 76667, 77477, 77977, 78787, 78887, 79697, 79997, 1879781, 1895981, 1969691, 1987891, 1988891, 1998991, 3799973, 3899983, 3997993, 3998993, 7696967 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Shyam Sunder Gupta, Table of n, a(n) for n = 1..157

MATHEMATICA

a = {}; t = 0; Do[z = n*10^(IntegerLength[n] - 1) + FromDigits@Rest@Reverse@IntegerDigits[n]; If[PrimeQ[z], s = Apply[Plus, IntegerDigits[z]]; If[s >= t, t = s; AppendTo[a, z]]], {n, 10^5}]; a

CROSSREFS

Cf. A002385, A067954.

Sequence in context: A054218 A075048 A281021 * A098463 A064155 A230047

Adjacent sequences:  A230043 A230044 A230045 * A230047 A230048 A230049

KEYWORD

nonn,base

AUTHOR

Shyam Sunder Gupta, Oct 06 2013

STATUS

approved

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Last modified December 3 18:19 EST 2021. Contains 349467 sequences. (Running on oeis4.)