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 A094178 Numbers n such that 4n+1 is divisible only by primes of form 4m+1 (i.e., by the Pythagorean primes A002144). 5
 1, 3, 4, 6, 7, 9, 10, 13, 15, 16, 18, 21, 22, 24, 25, 27, 28, 31, 34, 36, 37, 39, 42, 43, 45, 46, 48, 49, 51, 55, 57, 58, 60, 64, 66, 67, 69, 70, 72, 73, 76, 78, 79, 81, 84, 87, 88, 91, 93, 94, 97, 99, 100, 102, 105, 106, 108, 111, 112, 114, 115, 120, 121, 123, 126, 127 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS For the actual numbers 4n+1, see A008846(n). Complement of A124934; A125203(a(n)) = 0; A000290 and A000217 are subsequences. - Reinhard Zumkeller, Nov 24 2006 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 PROG (Haskell) import Data.List (elemIndices) a094178 n = a094178_list !! (n-1) a094178_list = map (+ 1) \$ elemIndices 0 a125203_list -- Reinhard Zumkeller, Jan 02 2013 CROSSREFS Sequence in context: A140758 A292987 A187580 * A085795 A068675 A190858 Adjacent sequences:  A094175 A094176 A094177 * A094179 A094180 A094181 KEYWORD nonn AUTHOR Lekraj Beedassy, May 06 2004 EXTENSIONS More terms from Ray Chandler, Jun 20 2004 STATUS approved

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Last modified September 18 11:20 EDT 2021. Contains 347518 sequences. (Running on oeis4.)