30903

Appears in sequences

• Base-10 palindromes that starts with 3.at n=31A043038
• Largest palindromic substring in 9^n.at n=33A046267
• Palindromes with exactly 2 palindromic prime factors (counted with multiplicity), and no other prime factors.at n=34A046376
• Palindromes with exactly 2 distinct palindromic prime factors.at n=30A046408
• Palindromes expressible as the sum of 3 consecutive palindromes.at n=24A046498
• a(n) is the odd-length palindrome whose digits up to the center are those of n and whose center digit is equal to the digital root of the product of the factorial of n and the reverse of n.at n=29A082941
• a(1) = 2; then least palindrome greater than the previous term such that every partial concatenation is a prime.at n=14A088084
• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 7 which is flat, i.e., with all blocks in parallel position, and symmetric after a rotation by 180 degrees.at n=8A123805
• Numbers k such that k and k^2 use only the digits 0, 3, 4, 5 and 9.at n=7A136929
• a(n) = (n+1)-th term of the (n+1)-th inverse binomial transform of this sequence for n>=0.at n=6A138983
• Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format D.M.YY. The terms are listed as numbers (without the dots).at n=28A210890
• Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format D.M.YY. The terms are listed as numbers. Leading zeros of the terms are suppressed.at n=27A210892
• Palindromic composite numbers starting with a digit 3.at n=21A222726
• G.f. A(x) satisfies: Sum_{n>=0} x^n * A(x)^(n*(n-1)/2) = 1 / Sum_{n>=0} (-x)^n * A(x)^(n*(n+1)/2).at n=8A337913