45850

Appears in sequences

• a(n) = round(10000*log_2(n)).at n=23A004269
• a(n) = ceiling(10000*log_2(n)).at n=23A004270
• Trajectory of 1 under map n->29n+1 if n odd, n->n/2 if n even.at n=8A033971
• McKay-Thompson series of class 40C for Monster.at n=58A058664
• Pentagonal numbers for which the sum of the digits is also a pentagonal number.at n=20A117709
• Pentagonal numbers for which both the sum of the digits and the product of the digits are pentagonal numbers.at n=10A117711
• a(n) = (2*n^3 + 5*n^2 - 5*n)/2.at n=34A162265
• Pentagonal numbers (A000326) in which parity of digits alternates.at n=23A297644
• The first of three consecutive pentagonal numbers the sum of which is equal to the sum of three consecutive primes.at n=2A298250
• a(n) = (A001359(n+1)^2 - 1)/24, where A001359 = lesser of twin primes; or: pentagonal numbers (A000326) whose indices are twin ranks (A002822).at n=36A308344