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 A062351 Palindromic primes with strictly increasing digits up to the middle and then strictly decreasing. 7
 2, 3, 5, 7, 11, 131, 151, 181, 191, 353, 373, 383, 787, 797, 12421, 12721, 12821, 13831, 13931, 14741, 17971, 34543, 34843, 35753, 1235321, 1245421, 1257521, 1268621, 1278721, 1456541, 1469641, 1489841, 1579751, 1589851, 3479743 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The last term of the finite series is a(63) = 123467898764321. LINKS Nathaniel Johnston, Table of n, a(n) for n = 1..63 (complete sequence) Patrick De Geest, World of Palindromic Primes EXAMPLE 13831 belongs to the sequence as it is a palindromic prime in which the digits are increasing up to the middle digit 8 and then decreasing. PROG (Python) from sympy import isprime from itertools import combinations def agen(): for digits in range(1, 19): for left in combinations("123456789", (digits+1)//2): left = "".join(left) yield int(left + (left[:digits//2])[::-1]) print(list(filter(isprime, agen()))) # Michael S. Branicky, Apr 25 2021 CROSSREFS Cf. A343524 (strictly increasing palindromes), A062352, A084836. Sequence in context: A049575 A070028 A084836 * A185267 A088249 A241724 Adjacent sequences: A062348 A062349 A062350 * A062352 A062353 A062354 KEYWORD nonn,base,easy,fini,full AUTHOR Amarnath Murthy, Jun 23 2001 EXTENSIONS Corrected and edited by Patrick De Geest, Jun 07 2003 STATUS approved

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Last modified June 23 08:25 EDT 2024. Contains 373629 sequences. (Running on oeis4.)