33153

Appears in sequences

• Centered icosahedral (or cuboctahedral) numbers, also crystal ball sequence for f.c.c. lattice.at n=21A005902
• Euler pseudoprimes: composite numbers n such that 2^((n-1)/2) == +-1 (mod n).at n=25A006970
• Composite numbers k such that k == +-1 (mod 8) and 2^((k-1)/2) == 1 (mod k).at n=18A006971
• The (2^n+1)-th triangular number (cf. A000217).at n=8A028401
• Odd triangular numbers with prime indices.at n=25A034954
• Smallest triangular number containing exactly n 3's.at n=2A036520
• Euler-Jacobi pseudoprimes: 2^((n-1)/2) == (2 / n) mod n, where (2 / n) is a Jacobi symbol.at n=20A047713
• Triangular numbers with sum of digits = 15.at n=36A068130
• Triangular numbers which are a concatenation of two or more positive triangular numbers.at n=33A068144
• Sarrus numbers n (A001567) which satisfy mu(n) = -1 and which are not Super-Poulet numbers (A050217).at n=21A074380
• Sarrus numbers with more than 2 distinct prime factors.at n=24A080747
• Third row of Pascal-(1,6,1) array A081581.at n=37A081591
• Pseudotwinprimes p+2 for primes p such that p+2 divides p^(p+2)+2 and p+2 is composite.at n=16A100873
• Pseudoquadprimes: p+4 for primes p where p+4 divides p^(p+4) + 4 and p+4 is composite.at n=11A100875
• Triangular numbers whose digit reversal is the product of 2 palindromes greater than 1.at n=32A115702
• Number of permutations of length n which avoid the patterns 1234, 2431, 3421.at n=14A116834
• Hexagonal numbers for which the sum of the digits is also a hexagonal number.at n=28A117062
• Triangular numbers with only odd digits.at n=21A117960
• Triangular numbers composed of digits {1,3,5}.at n=7A119113
• Number of lines in a Pauli graph of order n.at n=6A127069