18493

Properties

Appears in sequences

• Number of 4-connected polyhedral graphs with n nodes.at n=9A007027
• a(0) = 1, a(n) = 11*n^2 + 2 for n>0.at n=41A010003
• Primes of form k^2 - 3.at n=24A028874
• Numbers whose square with its last digit deleted is also a square.at n=20A031149
• a()=A037260 and its first [ A037261 ], 2nd [ A037262 ] and 3rd [ A037263 ] differences together include every number at most once and are monotonic and minimal.at n=21A037260
• Numerators of continued fraction convergents to sqrt(160).at n=9A041294
• Numerators of continued fraction convergents to sqrt(640).at n=7A042228
• Numbers k such that k^2 is formed from two subsquares that overlap in a single digit.at n=12A048422
• Primes p such that the decimal digits of p^2 can be partitioned into two or more nonzero squares.at n=33A048646
• a(n) = Sum_{k=1..n} T(n,k), array T as in A049790.at n=37A049791
• Primes p such that x^67 = 2 has no solution mod p.at n=31A059330
• Class 6+ primes.at n=21A081634
• Sum of the n smallest numbers having the sum of their digits equal to n.at n=21A081928
• For n > 1, a(n) is the smallest number such that n-th concatenation is prime and the smallest palindrome beginning with (but not equal to) this concatenation is also prime.at n=19A088090
• Initial members of 25 consecutive primes in a 5 X 5 spiral wherein the mean of all 12 sums is prime.at n=32A094458
• Primes p that divide Fibonacci[(p+1)/7].at n=24A125252
• Prime numbers n such that n^2 +- (n-1) are primes.at n=41A137459
• Primes congruent to 49 mod 53.at n=39A142579
• Primes congruent to 26 mod 59.at n=33A142753
• Primes congruent to 10 mod 61.at n=38A142808