31124

Appears in sequences

• a(n) is the concatenation of n and 4n.at n=30A019552
• Character of extremal vertex operator algebra of rank 15.5.at n=4A028525
• Numbers whose set of base-13 digits is {1,2}.at n=37A032933
• Number of partitions of n with equal number of parts congruent to each of 0 and 2 (mod 5).at n=50A035553
• Numbers k such that k divides the (k+1)st Lucas number.at n=9A094397
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11000-01111-11000 pattern in any orientation.at n=20A147456
• 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, 0, 1), (1, 0, 0), (1, 1, -1)}.at n=11A148131
• Numbers k such that 33*10^k + 7 is prime.at n=27A275285
• Sum of the fifth largest parts in the partitions of n into 8 parts.at n=47A308994
• Even composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 3 (mod m), where U(m)=A001906(m) and V(m)=A005248(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=3 and b=1, respectively.at n=11A337777
• Even composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 7 (mod m), where U(m)=A004187(m) and V(m)=A056854(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=7 and b=1, respectively.at n=43A337782
• The lexicographically earliest "Increasing Term Fractal Jump Sequence" that does not use the digit 0 in any terms.at n=19A359385
• Concatenate the terms of A027750 (omitting spaces and commas), chop into blocks of length 5, then omit any leading zeros.at n=28A362446