18599

Appears in sequences

• Number of partitions of n into parts not of the form 23k, 23k+4 or 23k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 10 are greater than 1.at n=39A035992
• First differences of A037260.at n=40A037261
• 2*3*5*6*...*a(n) -+ 1 are primes, with a(n+1) > a(n).at n=43A087900
• Ulam's spiral (WSW spoke).at n=34A143854
• Numbers k with the property that it is possible to write the base 2 expansion of k as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have sigma(a) + sigma (b) = sigma(k) - k.at n=29A258813
• a(n) = round(Shi(n)) where Shi(x) is the sinh integral function.at n=13A383542
• a(n) = round(Chi(n)) where Chi(x) is the cosh integral function.at n=12A383692
• a(n) = numerator(Sum_{k=1..n} d(k+1)/d(k)), where d is the number of divisors function.at n=36A386925