155861

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 31.at n=21A031619
• Least prime p of a quartet of 4 distinct primes {p, p+2, q, q+2} such that each digit of q is the same as the corresponding digit of p except that each 6 in p corresponds to a 9 in q and vice versa.at n=33A122712
• Lesser of twin primes (p,q=p+2) such that p*q-p-q and p*q+p+q are primes.at n=14A126334
• Numbers in A137365 but not in A137366.at n=15A138556
• Number of nondecreasing arrangements of n numbers in -5..5 with sum zero and sum of squares not greater than n*30/3.at n=17A183923
• Prime numbersat n=14352