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A107973
Numbers of the form a^2 + b for a= 21 to 40 and b= 20 to 1 step -1.
0
461, 503, 547, 593, 641, 691, 743, 797, 853, 911, 971, 1033, 1097, 1163, 1231, 1301, 1373, 1447, 1523, 1601
OFFSET
1,1
COMMENTS
Complete list of 20 prime numbers also of the form n^2+n+41 for n=20 to 39
EXAMPLE
21*21+20=461
22*22+19=503
23*23+18=547
MATHEMATICA
#[[1]]^2+#[[2]]&/@Thread[{Range[21, 40], Range[20, 1, -1]}] (* Harvey P. Dale, Jan 01 2018 *)
CROSSREFS
Sequence in context: A252535 A264242 A358894 * A227994 A142832 A277989
KEYWORD
fini,full,nonn
AUTHOR
Pierre CAMI, Jun 12 2005
STATUS
approved