390390

Appears in sequences

• nextprime(5^n)-nextprime(2^n).at n=8A037132
• Numbers with exactly 6 distinct prime divisors {2,3,5,7,11,13}.at n=12A147573
• Third right hand column of triangle A163932.at n=11A163933
• Integer areas of the tangential triangles corresponding to the integer-sided triangles with integer areas.at n=10A230361
• Average of twin prime pairs n having their decimal expansion of the form abcabc or abcabc0 such that n contains three twin primes as divisors.at n=4A235716
• Self-inverse permutation of nonnegative integers, A075158-conjugate of the inverse of gray code: a(n) = 1 + A075157(A006068(A075158(n-1))).at n=36A245452
• Self-inverse permutation of nonnegative integers, A075158-conjugate of blue code: a(n) = 1 + A075157(A193231(A075158(n-1))).at n=36A245454
• Numbers k such that k-17, k-1, k+1 and k+17 are consecutive primes.at n=14A262176
• a(0) = 1; for n >= 1, a(n) = A000040(n) * A002110(n).at n=6A286630
• Numbers m that set records for the ratio A045763(n)/n.at n=39A294492
• Numbers k that are neither squarefree nor prime powers such that A119288(k) <= k/A007947(k) < A053669(k) and k has a primorial kernel but is not a product of primorials.at n=20A369419
• Numbers k neither squarefree nor prime powers such that A119288(k) <= k/A007947(k) < A053669(k) and A007947(k) is a primorial P(i) = A002110(i) for some i.at n=34A369540