A068820 Ulam numbers that are primes.

2, 3, 11, 13, 47, 53, 97, 131, 197, 241, 409, 431, 607, 673, 739, 751, 983, 991, 1103, 1433, 1489, 1531, 1553, 1709, 1721, 2371, 2393, 2447, 2633, 2789, 2833, 2897, 3041, 3109, 3217, 3371, 3373, 3527, 3547, 3593, 3671, 3691, 4057, 4153, 4211, 4297, 4363

Offset

1,1

Links

Charles R Greathouse IV, Table of n, a(n) for n = 1..49221

Maple

# Function 'UlamList' is defined in A002858.
UlamPrimes := n -> select(k->isprime(k), UlamList(n)):
UlamPrimes(403); # Peter Luschny, Apr 05 2019

Crossrefs

Cf. A002858.

Sequence in context: A048891 A215358 A191057 * A129670 A215374 A355542

Adjacent sequences: A068817 A068818 A068819 * A068821 A068822 A068823

Keyword

easy,nonn

Author

Naohiro Nomoto, Mar 29 2002

Status

approved