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 A084836 Palindromic primes with nondecreasing digits up to the middle and then nonincreasing. 3
 2, 3, 5, 7, 11, 131, 151, 181, 191, 353, 373, 383, 787, 797, 11311, 11411, 12421, 12721, 12821, 13331, 13831, 13931, 14741, 15551, 16661, 17971, 19991, 33533, 34543, 34843, 35753, 77977, 78887, 79997, 1114111, 1117111, 1123211, 1126211, 1129211, 1134311 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Michael S. Branicky, Table of n, a(n) for n = 1..10000 Patrick De Geest, World of Palindromic Primes PROG (Python) from sympy import isprime from itertools import count, islice, combinations_with_replacement as mc def agen(): yield from (2, 3, 5, 7, 11) for d in count(2): ndni = (int("".join(m+m[:-1][::-1])) for m in mc("123456789", d)) yield from filter(isprime, ndni) print(list(islice(agen(), 40))) # Michael S. Branicky, Jun 26 2022 CROSSREFS Cf. A084837, A062351, A062352. Sequence in context: A069598 A049575 A070028 * A062351 A185267 A088249 Adjacent sequences: A084833 A084834 A084835 * A084837 A084838 A084839 KEYWORD nonn,base AUTHOR Patrick De Geest, Jun 07 2003 EXTENSIONS a(39) and beyond from Michael S. Branicky, Jun 26 2022 STATUS approved

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Last modified May 30 03:30 EDT 2024. Contains 372957 sequences. (Running on oeis4.)