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 A015945 Positive integers n such that n | (2^n + n/2 + 1). 2
 2, 10, 50, 250, 410, 1250, 2050, 5050, 6250, 10250, 16810, 25250, 31250, 51250, 84050, 126250, 156250, 207050, 256250, 336610, 405050, 420250, 510050, 631250, 689210, 781250, 1035250, 1281250, 1683050, 1750250, 2025250, 2101250, 2550250, 3156250, 3446050 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(n) = 2 * A015950(n). - Max Alekseyev, Aug 04 2011 PROG (Python) A015945_list = [n for n in range(2, 10**6, 2) if pow(2, n, n) == n//2-1] # Chai Wah Wu, Mar 25 2021 CROSSREFS Sequence in context: A218778 A320521 A180266 * A015954 A015949 A020699 Adjacent sequences:  A015942 A015943 A015944 * A015946 A015947 A015948 KEYWORD nonn AUTHOR STATUS approved

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Last modified May 12 10:54 EDT 2021. Contains 343821 sequences. (Running on oeis4.)