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A068820 Ulam numbers that are primes. 4
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 (list; graph; refs; listen; history; text; internal format)
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 A057324

Adjacent sequences:  A068817 A068818 A068819 * A068821 A068822 A068823

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto, Mar 29 2002

STATUS

approved

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Last modified June 19 23:01 EDT 2019. Contains 324222 sequences. (Running on oeis4.)