

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
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OFFSET

1,1


COMMENTS

Complete list of 20 prime numbers also of the form n^2+n+41 for n=20 to 39


LINKS

Table of n, a(n) for n=1..20.


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: A329292 A252535 A264242 * A227994 A142832 A277989
Adjacent sequences: A107970 A107971 A107972 * A107974 A107975 A107976


KEYWORD

fini,full,nonn


AUTHOR

Pierre CAMI, Jun 12 2005


STATUS

approved



