40301

Appears in sequences

• Let F(x) = 1 + x + 4x^2 + 9x^3 + ... = g.f. for A002835 (solid partitions restricted to two planes) and expand (1-x)*(1-x^2)*(1-x^3)*...*F(x) in powers of x.at n=18A005980
• n-th 6k+1 prime times n-th 6k-1 prime.at n=21A048629
• Numbers x such that sigma(x)-x divides x-1, other than prime powers.at n=11A059047
• Semiprimes in A033951.at n=33A113691
• Area of consecutive Prime-Indexed Prime rectangles.at n=13A119658
• 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, -1, 0), (-1, 1, 0), (0, 1, 1), (1, 0, 0)}.at n=9A149987
• Size of the equivalence class of S_n containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> bac <--> cba, where a<b<c.at n=8A212419
• Composite numbers which contain their sum of aliquot parts as a substring.at n=12A225417
• a(n) = n! - prime(n).at n=7A261809
• Sequence of pairwise relatively prime numbers of class P_7 (see comment in A275246).at n=22A275252
• Numbers k such that 98*10^k - 3 is prime.at n=22A288151
• a(n) is the number of distinct values of the determinant of an n X n symmetric Toeplitz matrix using the first n prime numbers.at n=8A369832
• Index where n first appears in A381597.at n=44A381599