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 A271578 Magic sums of 4 X 4 magic squares composed of primes. 3
 120, 126, 132, 136, 138, 140, 142, 144, 146, 148, 150, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS I conjecture that every even number greater than 152 belongs to this sequence. LINKS Table of n, a(n) for n=1..52. Wikipedia, Magic square Index entries for sequences related to magic squares FORMULA If conjecture is true, a(n) = A005843(n+65) for n >= 12. EXAMPLE Examples of 4 X 4 magic squares composed of primes. . |---|---|---|---| | 3 | 7 | 43| 67| |---|---|---|---| | 31| 61| 17| 11| |---|---|---|---| | 73| 23| 19| 5 | |---|---|---|---| | 13| 29| 41| 37| |---|---|---|---| The magic constant is 120 = a(1). . |---|---|---|---| | 3 | 7 | 43| 73| |---|---|---|---| | 31| 67| 17| 11| |---|---|---|---| | 79| 23| 19| 5 | |---|---|---|---| | 13| 29| 47| 37| |---|---|---|---| The magic constant is 126 = a(2). CROSSREFS Cf. A000040, A164843, A268790. Sequence in context: A117645 A157425 A030501 * A297152 A074302 A095631 Adjacent sequences: A271575 A271576 A271577 * A271579 A271580 A271581 KEYWORD nonn AUTHOR _Arkadiusz Wesolowski_, Apr 10 2016 STATUS approved

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Last modified May 23 15:34 EDT 2024. Contains 372763 sequences. (Running on oeis4.)