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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Complete list of 20 prime numbers also of the form n^2+n+41 for n=20 to 39 LINKS 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

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Last modified January 18 05:09 EST 2020. Contains 330995 sequences. (Running on oeis4.)