21101

Properties

Appears in sequences

• Primes having only {0, 1, 2} as digits.at n=20A036953
• Partial sums of A000084.at n=11A058351
• Primes whose sum of digits is 5.at n=25A062341
• Primes with arithmetic mean of digits = 1 (sum of digits = number of digits).at n=15A069710
• Primes of form 4k+3 written in base 3.at n=23A072805
• Duplicate of A069710.at n=15A073903
• Numbers k such that k, sigma(k) and phi(k) have the same decimal digits (ignoring multiplicity).at n=31A082059
• Factorial expansions of the entries in A085220.at n=47A085222
• Prime numbers such that first reversing digits and after squaring equals the result of first-squaring and after-reversing. Primes in A085305.at n=34A085306
• Primes whose decimal representation also represents a prime in base 3.at n=8A089981
• Primes with maximal digit = 2.at n=17A106100
• Greater of number pair whose squares are reversals of each other, with no leading zeros allowed.at n=38A106324
• Primes with at most n digits and a digit sum n in ascending order. 2,11; 3; 13,31,103,211,1021,2011,3001; 5,23,41,113,...at n=36A110741
• a(n) = 15*n*(n+1) + 11.at n=37A132208
• Primes p such that continued fraction of (1 + sqrt(p))/2 has period 11: primes in A146335.at n=32A146356
• Greater of two consecutive primes, p < q, such that both p*q+p-q and p*q-p+q are prime numbers.at n=28A154552
• Prime numbers ending in the prime number 101.at n=7A167626
• Primes of the form 100p + 1, where p is prime.at n=12A180469
• Numbers whose largest digit of all divisors is 2.at n=24A221697
• a(1) = 5; a(n) for n > 1 is the smallest prime > a(n-1) that differs from a(n-1) by a square.at n=48A246760