19097

Appears in sequences

• a(n) = ceiling(n*phi^15), where phi is the golden ratio, A001622.at n=14A004970
• Expansion of e.g.f. cos(tanh(sin(x))), even powers only.at n=4A009085
• Expansion of e.g.f.: exp(tan(sinh(x))).at n=8A009239
• Strong pseudoprimes to base 99.at n=18A020325
• a(n) = dot_product(1,2,...,n)*(3,4,...,n,1,2).at n=36A026037
• Number of solenoidal flows (flow in = flow out) in a 3 X 3 square array with integer velocities -n .. n.at n=7A068722
• Number of solenoidal flows (flow in = flow out) in an n X n square array with integer velocities in -7 .. 7.at n=2A068732
• a(n) = n^2*(2*n^2 + 1)/3.at n=13A071270
• a(n) = 10*n^2 - 6*n + 1.at n=43A087348
• Pell pseudoprimes: odd composite numbers n such that P(n)-Kronecker(2,n) is divisible by n.at n=25A099011
• Pentagonal numbers (A000326) whose digit reversal is a brilliant number (A078972).at n=11A115680
• Pentagonal numbers (A000326) whose digit reversal is a semiprime (A001358).at n=33A115709
• Pentagonal numbers with prime indices.at n=29A116995
• Number of base 15 circular n-digit numbers with adjacent digits differing by 7 or less.at n=4A125427
• Members of A038512 of the form k, k+2, k+6, k+8.at n=26A155511
• Positive numbers y such that y^2 is of the form x^2+(x+113)^2 with integer x.at n=10A161479
• a(n) = (2*n^3 + 5*n^2 - 13*n)/2.at n=25A162262
• Nonprime numbers with a sum of nonprime divisors which is a perfect square.at n=32A194580
• Number of arrays of 2n nondecreasing integers in -3..3 with sum zero and equal numbers greater than zero and less than zero.at n=23A203286
• Number of (w,x,y,z) with all terms in {1,...,n} and w > |x-y| + |y-z|.at n=15A212674