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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

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

EXAMPLE

21*21+20=461

22*22+19=503

23*23+18=547

CROSSREFS

Sequence in context: A048923 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 August 22 20:19 EDT 2017. Contains 290951 sequences.