24130

Appears in sequences

• 4-dimensional analog of centered polygonal numbers.at n=20A006325
• Number of unlabeled bisectable trees with 2n+1 nodes.at n=11A007098
• Numbers k such that k | 10^k + 10.at n=21A015902
• Pseudoprimes to base 11.at n=39A020139
• Number of plane regions after drawing (in general position) a convex n-gon and all its diagonals.at n=27A027927
• Each permutation in the list A060117 converted to Site Swap notation, with digits reversed and inverted. "Zero throws" (fixed elements) indicated with 0's.at n=38A060498
• Even pseudoprimes to base 11.at n=6A090084
• Indices n of primes p(n), p(n+4) such that p(n)+1 and p(n+4)+1 have the same largest prime factor.at n=13A105408
• Pentagonal numbers (A000326) whose digit reversal is a semiprime (A001358).at n=37A115709
• Pentagonal numbers with prime indices.at n=30A116995
• Pentagonal numbers (A000326) which are the sum of 2 other positive pentagonal numbers.at n=32A136117
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.at n=9A148896
• Number of different fixed (possibly) disconnected tetrominoes bounded tightly by an n X n square.at n=8A163434
• 1/4 the number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having distinct edge sums.at n=10A209376
• In base 5, numbers n which have 5 distinct digits, do not start with 0, and have property that the product (written in base 5) of any two adjacent digits is a substring of n.at n=7A210016
• Pentagonal numbers that are also Niven numbers.at n=34A242043
• Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 0 and no row sum 2 and no column sum 2.at n=18A255220
• a(n) = n*(n+1)*(7*n-6)/2.at n=19A256718
• Alternating sum of heptagonal pyramidal numbers.at n=38A269428
• Irregular table read by rows: n-th row lists the 16 n-gonal numbers of a 4 X 4 magic square with the smallest magic sum, and the sum of the first two terms of each row is as small as it is possible.at n=33A271711