31860

Appears in sequences

• a(n) = 18*(n - 2)*(2*n - 5).at n=30A060787
• a(n) = prime(n)^2 - prime(n+1).at n=40A062235
• Composite numbers requiring increasingly larger bases to become prime by base reversal.at n=23A075243
• Triangle read by rows: row n gives coefficients of expansion of q-tangent number T_{2n+1}(q) in powers of q.at n=47A143194
• Triangle read by rows: row n gives coefficients of expansion of q-tangent number T_{2n+1}(q) in powers of q.at n=48A143194
• a(n) = (7*n+2)*(7*n+5) = 49*n^2 + 49*n + 10.at n=25A177060
• Number of nondecreasing strings of numbers x(i=1..n) in -3..3 with sum x(i)^3 equal to 0.at n=44A188271
• Number of ordered triples (w,x,y) with all terms in {-n, ..., -1, 1, ..., n} and 5w + x + y > 0.at n=20A211630
• Govindarajan's triangle C-hat arising in enumeration of multi-dimensional partitions, read by rows.at n=33A216806
• Exponential (2,4)-perfect numbers: numbers m such that esigma(esigma(m)) = 4m, where esigma(m) is the sum of exponential divisors of m (A051377).at n=14A328133
• Number of left-labeled (3,n)-bipartite graphs.at n=15A370081