67626

Appears in sequences

• Even pentagonal pyramidal numbers.at n=38A015224
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 20.at n=26A031698
• a(n) = concatenation of n^2 and n.at n=25A055436
• a(n) = 100*n^2 + n.at n=25A055438
• Coefficients of even-indexed Euler polynomials (falling powers without zeros).at n=49A060082
• a(n) = n * [1 + sum(k=1 to n-1) prime(k)].at n=34A083719
• a(n) = (n+1)*(2n+1)^2.at n=25A139757
• a(n) = 400*n^2 + 2*n.at n=12A158312
• a(n) = 676*n^2 + 26.at n=10A158643
• a(n) = n^2*(n+1)*(3*n+1)/4.at n=17A213827
• 25-gonal pyramidal numbers: a(n) = n*(n+1)*(23*n-20)/6.at n=26A256645
• Number of Schur rings over Z_{2^n}.at n=9A270789
• Third diagonal sequence of the Sheffer triangle A094816 (special Charlier).at n=25A290312
• Pentagonal pyramidal numbers divisible by 3.at n=34A299412
• Number of integer partitions of 2n - 1 with the same length as alternating sum.at n=32A357488