51015

Appears in sequences

• Palindromes of the form n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2.at n=1A027580
• Base-6 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3,2.at n=6A037683
• Numbers that are palindromic and divisible by 5.at n=33A043040
• Palindromes with exactly 4 distinct prime factors.at n=27A046394
• Palindromes which are the concatenation of 3 or more terms of an arithmetic sequence with nonzero difference.at n=2A062564
• a(n) = T(n) concatenated with reverse(T(n)) divided by 11, where T(n) is the n-th triangular number.at n=33A084008
• Repeated terms in A087657 (a(n) = |prime(n)-a(n-1)| + |prime(n)-a(n-2)| + |prime(n)-a(n-3)| ).at n=7A087658
• Palindromic numbers which are sum of consecutive squares.at n=36A180436
• Number of 4-element nondividing subsets of {1, 2, ..., n}.at n=41A187491
• Palindromic numbers which can be written as the sum of two or more consecutive squares.at n=25A216446
• Records in A073053 starting from a(1).at n=26A305395
• Numbers k such that sigma(k) = sigma(k+19), where sigma(k) is the sum of the divisors of k.at n=21A321533