40404

Appears in sequences

• Alkane (or paraffin) numbers l(8,n).at n=22A005995
• Theta series of A*_13 lattice.at n=69A023925
• Palindromes that start with 4.at n=26A043039
• Palindromes with exactly 6 prime factors (counted with multiplicity).at n=17A046332
• Smallest multiple of n using only digits 0 and 4.at n=20A078243
• Smallest multiple of n using only digits 0 and 4.at n=38A078243
• a(1) = 1; a palindrome is included in the sequence if it has a prime signature that is different from all previous terms.at n=31A083433
• Palindromes in A085934.at n=40A085935
• a(n) = (n+1)^2*(n+2)*(n+3)*(3*n+4)/24.at n=11A108650
• a(1)=1; a(n) = the reversal of (a(n-1) + sfd(a(n-1))), where sfd(n)= sum of factorials of the digits of n.at n=4A121103
• Smallest sequence which lists the position of digits "3" in the sequence.at n=30A167453
• a(n) = Sum_{k=0..2n} C(2n,k)*A027907(n,k) where A027907 is the triangle of trinomial coefficients.at n=5A168595
• Numbers whose decimal expansion contains only 0's and 4's.at n=21A169967
• a(n) = 2*a(n-1) - 2*a(n-2) + a(n-3) + 2*a(n-4) starting with a(0..3) = 0, 0, 0, 1.at n=26A192395
• Dimensions of totally primitive elements of Hopf algebra PMN_1.at n=4A230885
• Number of squares of all sizes in 3*n*(n+1)/2-ominoes in form of three-quarters of Aztec diamonds.at n=46A258440
• Triangle read by rows, T(n,k) = Sum_{j=0..n} C(n,j)*L(j,k), L the unsigned Lah numbers A271703, for n>=0 and 0<=k<=n.at n=51A271705
• Convolution of nonzero hexagonal numbers (A000384) with themselves.at n=11A271870
• Shifts 6 places under binomial transform.at n=22A275936
• List of numbers k whose consecutive digits increase or decrease by d-1, where d is the number of digits in k.at n=88A292439