19140

Appears in sequences

• Number of plane partitions of n with at most two rows.at n=23A000990
• a(n) is square mod a(i), i < n; a(n) nonsquare; a(1) = 2.at n=17A034901
• Number of primes between n^4 and (n+1)^4.at n=41A061235
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,7.at n=17A064240
• Numbers k such that k-1, k+1 and k^2+1 are prime numbers.at n=36A070155
• Numbers k such that the sign of core(k)-phi(k) is not equal to 2*mu(k)^2-1, where core(k) is the squarefree part of k.at n=33A070237
• a(n) = Sum_{k=1..(p-1)*(p-2)} floor((k*p)^(1/3)) where p is the n-th prime.at n=10A078838
• Row sums in A083167.at n=29A083170
• Hendecagorials: n-th polygorial for k=11.at n=4A084944
• Difference between A007678(2n)/(2n) and (n-1)^2.at n=40A085611
• Fourth column of (1,5)-Pascal triangle A096940.at n=43A096941
• Numbers whose set of base 12 digits is {0,B}, where B base 12 = 11 base 10.at n=10A097258
• Repeatedly convert from sexagesimal to centesimal, starting with 60.at n=12A097714
• Numbers k such that k + sigma(k) + phi(k) is a square.at n=28A116009
• Numbers k such that 5^k mod k = 5^k mod k^2.at n=33A125775
• a(1)=2^3*5*7*29=8120; for n>1, a(n) = (-1)sigma(a(n-1)).at n=3A126602
• a(1)=2^3*5*7*29=8120; for n>1, a(n) = (-1)sigma(a(n-1)).at n=11A126602
• a(1)=2^3*5*7*29=8120; for n>1, a(n) = (-1)sigma(a(n-1)).at n=19A126602
• a(1)=2^3*5*7*29=8120; for n>1, a(n) = (-1)sigma(a(n-1)).at n=27A126602
• a(1)=2^3*5*7*29=8120; for n>1, a(n) = (-1)sigma(a(n-1)).at n=35A126602