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 A247207 4^(2^n) + 3^(2^n) + 2^(2^n) + 1. 0
 10, 30, 354, 72354, 4338079554, 18448597098193370754, 340282370354622283774333836163326852354, 115792089237316207213755562747271079374483128445080168181132550891186006948354 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS FORMULA a(n) = sum_{k = 1 .. 4} k^(2^n). For all n > 1, a(n) = 54 mod 100. EXAMPLE a(2) = 4^4 + 3^4 + 2^4 + 1 = 256 + 81 + 16 + 1 = 354. a(3) = 4^8 + 3^8 + 2^8 + 1 = 65536 + 6561 + 256 + 1 = 72354. MATHEMATICA Table[1 + Sum[k^(2^n), {k, 2, 4}], {n, 0, 7}] CROSSREFS Cf. A091775, A000855. Sequence in context: A256879 A064012 A276180 * A187521 A187624 A187633 Adjacent sequences:  A247204 A247205 A247206 * A247208 A247209 A247210 KEYWORD nonn,easy AUTHOR Alonso del Arte, Nov 25 2014 STATUS approved

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Last modified October 16 23:50 EDT 2019. Contains 328103 sequences. (Running on oeis4.)