81702

Appears in sequences

• Divide natural numbers in groups with prime(n) elements and add together.at n=23A034957
• a(n) is a non-palindromic composite located between twin primes whose reverse, which is less than it, is also located between twin primes.at n=28A103741
• Elements of A103741 that do not terminate in a zero digit.at n=9A103764
• Number of ways of writing n as the sum of 10 triangular numbers from A000217.at n=20A226254
• The Wiener index of the zig-zag polyhex nanotube TUHC_6[2n,2] defined pictorially in Fig. 1 of the Eliasi et al. reference.at n=25A227703
• Integers k with at least one proper factorization for which the sum of the same fixed integer power >= 2 of the factors equals k.at n=25A380760
• Integers k with at least 1 proper factorization for which the sum of the squares of the factors equals k.at n=11A380902