20147

Properties

Appears in sequences

• Primes which when added to their reversals are squares.at n=6A059799
• a(n) is the least prime p, such that next_prime(2*p) - 2*p = 2*n - 1.at n=24A059846
• Class 8- primes.at n=1A081427
• Primes p such that p+2, p^2 - 2p + 2, and p^2 - 2p + 4 are all prime.at n=12A101315
• Positions of records in A064097.at n=23A105017
• Primes for which the period of the reciprocal equals (p-1)/14.at n=18A135073
• Closest pair of primes p <= q such that p + q = n! Sequence gives the lesser member p of the pair.at n=5A137982
• Primes congruent to 28 mod 59.at n=37A142755
• Primes congruent to 17 mod 61.at n=34A142815
• Primes p such that the multiplicative order of 2 modulo p is (p-1)/7.at n=21A152307
• Prime numbers where the last digit is the sum of all the previous digits.at n=28A156617
• Smallest number with "natural" logarithm n, cf. A061373.at n=35A182061
• Primes from merging of 5 successive digits in decimal expansion of sqrt(2).at n=26A198165
• Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..2 n X 2 array.at n=20A219167
• Primes p of the form 14*k+1 for which there is a solution to x^7 == 2 mod p.at n=45A270802
• Primes p such that p+2, 3*p+2 and 3*p+8 are also primes.at n=16A278138
• Primes p such that the base-10 concatenations (p+1)||p and (p+1)||(p+1)||p are both prime.at n=39A309749
• Numbers in A231626 but not in A343302; first of 5 consecutive deficient numbers in arithmetic progression with common difference > 1.at n=35A343303
• Discriminants of imaginary quadratic fields with class number 37 (negated).at n=17A351675
• Indices of records in A366927.at n=11A366929